Skip to main content

Fomes weberianus, 50 years of taxonomic confusion: lectotypification and taxonomic notes


Fomes weberianus Bres. & Henn. ex Sacc. is currently the basionym of two very distinct polypores (Basidiomycota), Ganoderma weberianum (Polyporales) and Phylloporia weberiana (Hymenochaetales). This fact has led to almost fifty years of taxonomic confusion. Fomes weberianus was first lectotypified by Steyaert, who accepted the species as G. weberianum. However, studies of Weber’s original material in B, duplicate material in S, the protologue, and early interpretations of the name have shown that Steyaert’s choice conflicts with the protologue and early interpretations, and that his interpretation as a species of Ganoderma is erroneous. A new lectotype was designated and the species was re-described under the correct interpretation Phylloporia weberiana.


The herbarium name “Fomes weberianus” was ascribed by Bresadola and Henning to a collection originating from the Polynesian island of Samoa, collected by C. Weber, but the species was first validly published by Saccardo (1891). The diagnosis provided by Saccardo (1891) was based on a handwritten description of a currently undetermined authorship, a copy of which is available in a folder at B (B 700007410, Fig. 1).

Fig. 1
figure 1

Macro and micromorphological characters of Ganoderma rivulosum (B 700007410, as type of Fomes weberianus), A specimen with labels at B showing the Steyaert’s and Weber’s notes, B lateral view of the basidiome showing homogeneous context without “a black line”, C upper surface of the basidiome, D hymenophore, E cuticular cells in Melzer’s reagent, FG detail of contextual chlamydospores ornamented with completely or partially anastomosed ridges, in Melzer’s reagent. Scale bars A–D: 2 cm

Saccardo (1891) characterised F. weberianus as a polypore-like fungus, corky (“suberoso-lignoso”), sessile, with a duplex context (“strato duplice”), made of an upper tomentose to floccose layer (“superiori tomentoso-floccoso”) and a lower corky layer (“inferiori suberoso-lignoso”), both layers separated by a thin black line (“a superiore linea nigra limitato”). Saccardo (1891) also compared F. weberianus to some morphologically related taxa, including “Pol[yporus] circinato-tomentoso” and “Fomitem fastuosum Lev.”. “Pol[yporus] circinato-tomentoso” is currently accepted as either Onnia circinata (Fr.) P. Karst. or as O. tomentosa (Fr.) P. Karst., whereas “Fomitem fastuosum Lev.” is nowadays accepted as Fulvifomes fastuosus (Lév.) Bondartseva & S. Herrera. Onnia P. Karst. and Fulvifomes Murrill both belong to the Hymenochaetaceae (Ji et al. 2017; Wu et al. 2022).

Saccardo (1891) did not designate a type or a reference specimen. He only mentioned the existence of specimen(s) in the Berlin Museum (B) (“Exempl. In Museo Berolin”). However, Bresadola (1914b), studying specimens from the Philippines, mentioned a type (“the specimens [from the Philippines] agree very well with the type [of F. weberianus]”) but without indicating details unique to a single specimen or specifically citing a reference.

The name, Fomes weberianus Bres. & Henn. ex Sacc., is currently the basionym of two names that are applied to two unrelated differently classified species of polypores (Basidiomycota), viz. Ganoderma weberianum (Bres. & Henn. ex Sacc.) Steyaert (Polyporales; Steyaert 1972) and Phylloporia weberiana (Bres. & Henn. ex Sacc.) Ryvarden (Hymenochaetales; Ryvarden 1972). Steyaert (1972) proposed the combination G. weberianum and developed the concept of this Ganoderma species based on examination of a specimen at B, B 700007410, which he annotated as RLS.70.B.5 and which he designated as the type of F. weberianus. It is not clear why Steyaert (1972) studied and designated this specimen as the type during his revision of Ganoderma P. Karst. In the same year, Ryvarden (1972) proposed the combination Phylloporia weberiana but did not refer to any type or mention any specimen that he examined in developing his species concept. Later, Ryvarden, in his studies of the polypore types described by Bresadola (Ryvarden 1988) and Hennings (Ryvarden 2012), again did not mention any type of F. weberianus. These contradictions have caused confusion, as highlighted by Yombiyeni and Decock (2017) and Cabarroi-Hernández et al. (2019). For instance, Corner (1983, 1991) reported both G. weberianum and P. weberiana from the same locality in Malaysia (Pahang Tembeling).

It should also be mentioned that several authors have not considered the species as such, but as a synonym of either Polyporus capucinus Mont. [≡ Phylloporia capucina (Mont.) Ryvarden] (Bresadola 1926), Inonotus corrosus Murrill [≡ Phylloporia chrysites (Berk.) Ryvarden)] (Cunningham 1965), or Phellinus pectinatus (Klotzsch) Quél. [≡ Phylloporia pectinata (Klotzsch) Ryvarden)] (Larssen and Cobb-Poulle 1990). The present study aimed to resolve this taxonomic confusion through critical studies of the original material of Weber and analysis of the historical literature. It is important to advance both the taxonomic and nomenclature issues of organisms, rather than ignoring old names and simply describing new species with new names.


For this study, the original specimens of F. weberianus held at B and S (herbarium abbreviations follow Thiers, continuously updated) were studied.

The microscopic observations procedure followed Decock et al. (2007). Specimen sections were mounted in 5% KOH solution. Melzer’s reagent and cotton blue were used to test the amyloidity or dextrinoidity and cyanophyly of the microscopic structures, respectively. Microscopic characters were observed under a light microscope Olympus BX50. Images were captured using Axio Vision 4 software on the same microscope. At least 30 structures of each mature specimen were measured. Ganodermatoid basidiospores were measured without taking into account the apical umbo when it was not shrunken. Cuticular cells were measured from the middle part of the pileus except in the case of some type materials, where only a fragment was received as loan. Colour terms follow Kornerup and Wanscher (1981). To designate types of names, the provisions of the International Code of Nomenclature for algae, fungi, and plants were taken into account (Turland et al. 2018).


Two specimens labelled F. weberianus collected by Weber in Samoa are available at Berlin, B 700007410! and B 700021870!. Both specimens were studied by Steyaert (1972), under the reference numbers RLS.70.B.5 and RLS.B.70.14, respectively.

The specimen B 700007410 is labelled with block letters: “Fomes weberianus Bresad. & Henn. ex Sacc”. There are handwritten notes of Steayert considering the specimen as G. rivulosum and annotated “leg. C. Weber, in litt: Ins Samoa”. B 700007410 was annotated as “typus” by Steyaert (Fig. 1A). A copy of a handwritten description of “Fomes Weberianus n. sp.”, of an undetermined author, accompanies this specimen. Steyaert (1972) based his interpretation of F. weberianus on B 700007410.

This specimen has been damaged by insects (Fig. 1A–D). Nevertheless, it still presents all the main characters of a member of Ganoderma, including a laccate pileus in violet-brown tint, the cuticle composed of strongly amyloid, cylindrical to slightly clavate cells, and ellipsoid basidiospores with an apical, often shrunk umbo, with free pillars, 6.5–8 (–9.5) × 5 (–6.5) µm, and numerous contextual chlamydospores ornamented with completely or partially anastomosed ridges (Fig. 1E–G). The context is pale coloured, light yellow (4A4) toward the crust and light brown (7D3) in a narrow zone above the tubes, with some resinous bands.

The specimen B 700021870 is labelled: “Fomes Weberi”, “Samoa, Weber” and determined as F. weberianus by “Bresadola and P. Henn” (the first surname crossed out on the label). There is another label indicating “Fomes Weberianus P. Henn.”, “Samoa”, “Weber” (Fig. 2A). This collection (Fig. 2B) is composed of three fragments of a nodulous basidiome, cinnamon brown, with a duplex anatomy, made of thin, corky lower context and a comparatively thicker, softer, upper tomentum, both separated by a thin black line, a brown to greyish brown pore surface with very small pores, a dimitic hyphal system in the context and hymenophoral trama, with hyaline to yellowish generative hyphae, brownish, unbranched vegetative hyphae, a monomitic tomentum, and broadly ellipsoid to slightly ovoid, angular on drying, thick-walled, smooth, pale yellowish basidiospores, 3.0–4.0 × 2.5–3.0 μm.

Fig. 2
figure 2

Macromorphological characters of Phylloporia weberianum, in the type specimen of Fomes weberianus, AB specimen B 700021870! (Lectotype), A named by Steyaert as RLS.B.70.14, labelled: “Fomes Weberi”, “Samoa, Weber” and determined as F. weberianus by “Bresadola and P. Henn” (note the first surname crossed out on the small label at the top left), in the second label as “Fomes Weberianus P. Henn.”, “Samoa”, “Weber”, B basidiomata sessile, nodulous, cinnamon brown, with a duplex anatomy, made of thin, corky lower context and a comparatively thicker, softer, upper tomentum, both separated by a thin black line, C–D specimen S F15098! (Isolectotype) copyright: Naturhistoriska riksmuseet, Stockholm, annotated as type by Bresadola, C label with Bresadola’s notes, D basidiome sessile, nodulous, cinnamon brown, with a duplex anatomy, made of corky lower context and a thick, softer, upper tomentum, separated by a thin black line. Scale bar: 2 cm

In addition, there is a specimen at S, S F15098! (Fig. 2C–D) with the data “Samoa, Weber”, determined by Bresadola and Hennings as Fomes weberianus “n sp” “Typus!”. This specimen was annotated as type by Bresadola. It was not cited by Saccardo (1891). However, it could be the specimen referred to by Bresadola (Bresadola 1914b). It is, in all respects, morphologically identical to B 700021870 and represents in all probability a part of the original collection B 700021870.


Currently, there are three specimens annotated as “Fomes weberianus, Weber, Samoa”. Two are held at B (B 700007410! and B 700021870!), whereas the third one is part of the Bresadola Herbarium in S (S F15098!). These specimens represent two very distinct species.

The specimen B 700007410 is identified as a species of the Ganoderma resinaceum - weberianum complex as defined by Cabarroi-Hernández et al. (2019), close if not identical to G. rivulosum Pat. & Har., as previously suggested by Steyaert (1972). After analysing the type of G. rivulosum (S F181158!) described from Java (Patouillard and Hariot 1906), we observed that it shares many characters with B 700007410, such as the size and features of cuticle cells, basidiospores, and importantly contextual chlamydospores with double wall and anastomosed ridges (Fig. 1F–G). Smith and Sivasithamparam (2003) confirmed these observations, based on the examination of B 700007410 and additional specimens from Australia and the south Pacific region. The G. weberianum complex in Southeast Asia needs to be reassessed as shown by Cabarroi-Hernández et al. (2019).

However, the morphological features of B 700007410, including the smooth, shiny, laccate pileus and the dense homogeneous context, are in conflict with the original diagnosis of F. weberianus (Saccardo 1891); nothing in Saccardo’s diagnosis (1891) suggests a laccate, and therefore crustose, pileus, but, on the contrary, mentioned a double context with a tomentose to floccose upper part. Furthermore, as far as we have been able to ascertain, there was no interpretation of this taxon as a species of Ganoderma previous to Steyaert (1972).

The specimens B 700021870 and S F15098 are part of a single collection. Their main morphological features are in complete agreement with the original diagnosis of F. weberianus (Saccardo 1891). They belong to Phylloporia as currently defined (e.g., Wagner and Ryvarden 2002; Decock et al. 2013; Wu et al. 2019). For example, the presence of a thin black line in the basidiome, separating an upper floccose tomentum from a lower denser context, already highlighted by Saccardo (1891), and the small, ellipsoid to slightly ovoid basidiospores are morphological features of many Phylloporia species (e.g., Wagner and Ryvarden 2002; Decock et al. 2013; Wu et al. 2019).

Furthermore, in early interpretations of F. weberianus, authors prior to Steyaert (1972) all associated this name with species close to or synonymous with several taxa currently accepted in Phylloporia, or belonging to related genera of Hymenochaetaceae (Bresadola 1914b, 1916, 1926; Lloyd 1915; Cunningham 1950, 1965). Bresadola (1914a) did not mention F. weberianus in his article on exotic mushrooms in Berlin. However, he (Bresadola 1914b) did mention the species from the Philippines and noted that “the fungus is undoubtedly a form of Polyporus tabacinus Mont.”. Later, Bresadola (1916, 1926) confirmed this, not without correcting a “lapsus calami” (fide Bresadola 1926) present in the 1914 publication concerning synonymy, by replacing P. tabacinus (Bresadola 1914b), cited in error, with P. capucinus. Polyporus capucinus is now accepted as Phylloporia capucina (Ryvarden 1982).

Lloyd (1915) indicated also that Polyporus (Fomes) weberianus, as well as P. capucinus and P. chrysites Berk. were synonyms of P. fruticum Berk. & M.A. Curtis. However, he (Lloyd 1915) suggested that the two species could be distinguished, according to the thickness of the pileus: P. weberianus with a thick pileus, and the others as P. fruticum, with a thin pileus. These taxa are now accepted in Phylloporia as P. capucina, P. chrysites, and P. fruticum (Berk. & M.A. Curtis) Ryvarden (Ryvarden 1972; Decock et al. 2013; Wu et al. 2019).

Cunningham (1950) first proposed the recombination of Fomes weberianus as Coltricia weberiana (Bres. & Henn. ex Sacc.) G. Cunn. However, later on, he (Cunningham 1965) synonymized F. weberianus with C. corrosa (Murrill) G. Cunn., which is currently a synonym of P. chrysites (Ryvarden 1972).


Taxonomy is based on fixed type specimens, so in the case of F. weberianus Bres. & Henn. ex Sacc., there were errors when selecting the types. This began when Saccardo (1891) did not designate a type specimen when describing the species. Later, Bresadola (1914b) mentioned a type but without referring to a particular specimen. Steyaert (1972) was therefore the first to designate a referenced specimen, B 700007410, as the “holotype” of F. weberianus. However, in the absence of an original holotype, Steyaert’s (1972) typification is best treated as a lectotypification, as it has been corrected accordingly in the Index Fungorum under Art. 9.10 (Shenzhen, Turland et al. 2018), with the identifier 596564.

According to the International Code of Nomenclature for algae, fungi, and plants (Turland et al. 2018; Art. 9.19): “the author who first designates (Art. 7.10, 7.11, and F.5.4) a lectotype or a neotype in conformity with Art. 9.11–9.13, must be followed”. This would therefore impose the lectotype designated by Steyaert (1972) and his interpretation of F. weberianus as a species of Ganoderma.

However, the designation of a lectotype is not necessarily definitive, and may be replaced in several cases, as provided for in Art. 9.19 [including 9.19(c)], in particular “if it can be shown that it is in serious conflict with the protologue, in which case an element that is not in conflict with the protologue must be chosen; a lectotype may only be replaced by a non-conflicting element of the original material, if one exists”.

Our studies of Weber’s original material, developed above, confirmed that 1) the type designated by Steyaert is in serious conflict with the protologue of Saccardo (1891). As indicated above, nothing in the original diagnosis points towards a species of laccate Ganoderma. 2) Given the specimens from B (B 700021870) and S (F15098), the original diagnosis, and the interpretations of all authors prior to Steyaert (1972), the correct interpretation of F. weberianus is undoubtedly that of a species of Phylloporia, as established by Ryvarden (1972), and not of a species of Ganoderma as interpreted by Steyaert (1972). 3) Weber’s original material in agreement with the protologue exists, and this material could be designated as a new lectotype.

In conclusion, the typification of Steyaert (1972) is here rejected and the specimen B 700021870 is designated as the new lectotype, under Art. 9.19. The specimen S (F15098) is considered to be part of the original material, thus an isolectotype. Specimens of G. weberianum from South-East Asia are conservatively named G. rivulosum. Phylloporia weberiana is redescribed below on the basis of these two specimens.


Phylloporia weberiana (Bres. & Henn. ex Sacc.) Ryvarden, Norw. Jl Bot. 19: 235 (1972). Mycobank: 320282.

Basionym: Fomes weberianus Bres. & Henn. ex Sacc., Syll. Fung. 9: 174 (189).

Synonyms: Scindalma weberianum (Bres. & Henn. ex Sacc.) Kuntze, Revis. Gen. Pl. 3(3): 519 (1898).

Polyporus weberianus (Bres. & Henn. ex Sacc.) Sacc. & Trotter, Syll. Fung. 23: 383 (1925).

Coltricia weberiana (Bres. & Henn. ex Sacc.) G. Cunn., Proc. Linn. Soc. N.S.W. 75(3–4): 247 (1950).

Ganoderma weberianum (Bres. & Henn. ex Sacc.) Steyaert, Persoonia 7(1): 79 (1972).

Type: Samoa: “Samoa Island”, s. data, G. Weber (B 700021870 – lectotype designated here, IF: 901602; S F15098 (S) – isolectotype.

Description: Basidiomes pileate, sessile, overall with a hard corky consistency when dry; solitary; pileus nodulous, rounded, attached to the substrate only by a circular area at the back, semicircular to dimidiate in upper view, projecting horizontally 20 mm, 35 mm wide, to 15 mm at the thickest, margin outline regular; pileus surface azonate, smooth, overall homogeneously light brown (5[CD]6, honey yellow to light brown); margin rounded, greyish yellow, pale cork-coloured; pore surface plane to slightly concave (slightly incurved inside), brown to greyish brown (6E[6–7], cocoa brown); pores very small, regular, mostly round, 12–13 (–14) / mm, 65–90 μm diam (av. = 81 μm diam); dissepiments thin to thick, 25–75 μm thick (av. = 35 μm), agglutinated; tomentum homogeneous, corky to hard corky, up to 12 mm thick, homogeneous light brown (6[C-D]7, brownish orange, autumn leaf, light brown) but with a few faint concentric bands, with a thin basal black line separating the underlying comparatively much thinner context; context up to 3 mm thick, dense, corky, light brown (6[C–D]7, brownish orange, autumn leaf, light brown); tube layer single, concolorous with the pore surface (6E6, cocoa brown), gradually paler near the pore surface (6D6, cinnamon).

Hyphal system dimitic in the context and hymenophoral trama, monomitic in the tomentum; generative hyphae simple septate, thin- to slightly thick-walled, hyaline to faintly yellowish, scarcely branched, with a constriction at the branching point, 2.0–4.0 μm diam; tomentum with generative hyphae, initially arranged parallel to the black line, gradually erect, fan-shaped, usually unbranched or Y-branch, slightly thick- to thick-walled but with widely open lumen, occasionally some segments locally constricted, or inflated, septate with both true and secondary septa, apices rounded, yellowish to brownish, 4.5–8.0 μm diam (av. = 6.1 μm); context dominated by skeletal hyphae, subparallel to the black line, tightly packed, arising from a generative hyphae, 3.0–3.5 μm diam at the basal septa, progressively widening to 3.7–5.5 μm diam (av. = 4.8 μm), golden brown, darker brown in alkali, thick- to very thick-walled with the lumen wide to narrow, mostly aseptate throughout, or with few secondary septa near the apices; hymenophoral trama dominated by skeletal hyphae, mostly subparallel to the tube main axis, arising from a generative hyphae or a mediate hyphae, mostly terminal, of limited growth, measured 115 to 175 μm long, 2.5–3.0 μm diam at the basal septa to 3.3–4.3 μm diam (av. = 3.8 μm) in the main part, mostly straight, occasionally locally constricted or inflated (up to 4–5 μm), slightly thick-walled at the basal septa, progressively thick- to very thick-walled, with the lumen wide then narrow, locally lenticular, ending thin-walled, aseptate throughout but with a few secondary septa near the apices, golden brown, darker brown in alkali.

Hymenium: basidioles and basidia not observed; cystidioles not observed; basidiospores mostly broadly ellipsoid to slightly ovoid, a few ellipsoid, appearing somewhat angular on drying, thick-walled, smooth, pale yellowish in KOH, without reaction in Melzer’s reagent, 3.0–4.0 × 2.5–3.0 μm (av. = 3.5 × 2.8 μm), Q = 1.1–1.4 (av. Q = 1.3).

Notes: the type specimen of P. weberiana is characterised by solitary, nodulous, rounded basidiomes with a thin context subtending a comparatively thicker tomentum, both separated by a thin black line. The hyphal system is dimitic in the context and in the hymenophoral trama, monomitic in the tomentum, and the basidiospores are broadly elliptical, 3.0–4.0 × 2.5–3.0 μm. In addition to Samoa, the species has been reported on several occasions in the African and Asian Paleotropics (Cunningham 1965; Bakshi 1971; Ryvarden and Johansen 1980; Corner 1991; Wu et al. 2019; Ryvarden et al. 2022), and in the Neotropics (Wu et al. 2019) but these reports should be critically reconsidered.

Phylloporia weberiana as described by Cunningham (1965), under Coltricia corrosa, would best correspond to P. weberiana s.str., as they share the basidiome anatomy, with a duplex structure made of a thin lower context and a comparatively much thicker upper tomentum (up to 3 mm fide Cunningham 1965; and up to 15 mm thick in the lectotype), both separated by a thin black line, a pore field with a sterile border, small pores (respectively, 70–130 and 65–90 diam), and identical basidiospores, both in shape and size, elliptic to obovate, 3.0–4.0 × 2.5–3.0 μm. Sensu Cunningham (1965), it differs by having a concentrically sulcate pileus surface, but whose absence in the lectotype of P. weberiana might be due to its young state. Cunningham (1965) reported collections from Australia (Queensland and New South Wales) but also from Fiji, a Polynesian island neighbouring Samoa, in South Central Pacific. Analysis of this last specimen would help confirm conspecificity.

Corner (1991) reported the species from Malaysia and the Philippines in Southeast Asia. Phylloporia weberiana sensu Corner (1991) shares with P. weberiana s.s. the basidiome anatomy, a dimitic hyphal system, and basidiospores in similar shape and size. However, it differs by having a context comparatively thicker (2.5–18 mm) than the overlying tomentum (4–6 mm, fide Corner 1991), an anatomy which is inverted in P. weberiana, and larger pores, viz. 110–200 μm (vs. 65–90 μm, cf. above).

Ryvarden and Johansen (1980) reported the species as widely distributed in tropical Africa from Western (Ghana), Central (Cameroon, Democratic Republic of Congo, Nigeria, Uganda), and Eastern areas (Kenya, Tanzania), down to insular Madagascar. However, P. weberiana sensu Ryvarden and Johansen (1980) differs from P. weberiana s.s. in having much larger pores, mostly 5–6 / mm.

Availability of data and materials

All data generated or analysed during this study are included in this published article or are available from the corresponding authors on reasonable request.


  • Bakshi BK (1971) Indian Polyporaceae (on trees and timber). Indian Council of Agricultural Research, New Delhi

    Google Scholar 

  • Bresadola G (1914a) Fungi nonnulli exotici ex Museo Berolinensi. Ann Mycologici 12:539–544

    Google Scholar 

  • Bresadola G (1914b) Enumeration of Philippine Basidiomycetes. Philippine J Sci Sect C Bot 9(4):345–352

    Google Scholar 

  • Bresadola G (1916) Synonymia et adnotanda mycologica. Ann Mycologici 14(3–4):221–242

    Google Scholar 

  • Bresadola G (1926) Selecta Mycologica II cum tabula. Arti Grafische Scotoni Trento

  • Cabarroi-Hernández M, Villalobos-Arámbula AR, Torres-Torres MG, Decock C, Guzmán-Dávalos L (2019) The Ganoderma weberianum-resinaceum lineage: multilocus phylogenetic analysis and morphology confirm G. Mexicanum and G. Parvulum in the Neotropics. MycoKeys 59:95–131.

    Article  PubMed  PubMed Central  Google Scholar 

  • Corner EJH (1983) Ad polyporaceas I, Amauroderma and Ganoderma. Nova Hedwigia Beih. 75:1–182

    Google Scholar 

  • Corner EJH (1991) Ad polyporaceas VII: the xanthochroic polypores. Nova Hedwigia Beih 101:1–175

    Google Scholar 

  • Cunningham GH (1950) Australian Polyporaceae in herbaria of Royal Botanic Gardens, Kew, and British museum of natural history. Proc Linnean Society New South Wales 75:214–249

    Google Scholar 

  • Cunningham GH (1965) Polyporaceae of New Zealand. Bulletin (New Zealand. Dep Sci Industrial Res 164:1–304 (7 plates, 59 figs., 7 refs)

    Google Scholar 

  • Decock C, Herrera-Figueroa S, Robledo G, Castillo G (2007) Fomitiporia punctata (Basidiomycota, Hymenochaetales) and its presumed taxonomic synonyms in America: taxonomy and phylogeny of some species from tropical/subtropical area. Mycologia 99:733–752.

    Article  CAS  PubMed  Google Scholar 

  • Decock C, Amalfi M, Robledo G, Castillo G (2013) Phylloporia nouraguensis, an undescribed species on Myrtaceae from French guiana. Myrtaceae 34:15–27.

    Google Scholar 

  • Ji X-H, He S-H, Chen J-J, Si J, Wu F, Zhou L-W, Vlasák J, Tian X-M, Dai Y-C (2017) Global diversity and phylogeny of Onnia (Hymenochaetaceae) species on gymnosperms. Mycologia 109:27–34.

    Article  CAS  PubMed  Google Scholar 

  • Kornerup A, Wanscher JH (1981) Methuen handbook of colour, 3rd edn. Methuen, London

    Google Scholar 

  • Larsen MJ, Cobb-Poulle LA (1990) Phellinus (Hymenochaetaceae). A survey of the world taxa. Synopsis Fungorum, 3rd edn. Fungiflora, Oslo

    Google Scholar 

  • Lloyd CG (1915) Synopsis of the genus Fomes. Mycol Writings 4:209–288

    Google Scholar 

  • Patouillard N, Hariot P (1906) Fungorum novorum. Decas Secunda. Bull de la Société mycologique de France 22:118–119

    Google Scholar 

  • Ryvarden L (1972) A critical checklist of the Polyporaceae in tropical East Africa. Nor J Bot 19:229–238

    Google Scholar 

  • Ryvarden L (1982) Type studies in the Polyporaceae 11. Species described by J.F.C. Montagne, either alone or with other authors. Nord J Bot 2:75–84.

    Article  Google Scholar 

  • Ryvarden L (1988) Type studies in the Polyporaceae – 20. Species described by G. Bresadola. Mycotaxon 33:303–327

    Google Scholar 

  • Ryvarden L (2012) Type studies in Polyporaceae 27. Species described by P.Ch. Hennings. Czech Mycol 64:13–21

    Article  Google Scholar 

  • Ryvarden L, Johansen I (1980) A preliminary flora of East Africa. Fungiflora, Oslo

    Google Scholar 

  • Ryvarden L, Decock C, Mossebo D, Masuka J (2022) Poroid fungi of Africa. Synop Fungorum 45:1–270

    Google Scholar 

  • Saccardo PA (1891) Sylloge Fungorum IX. – [Hymenomyceteae, Polyporeae, Fomes], Padua

    Google Scholar 

  • Smith BJ, Sivasithamparam K (2003) Morphological studies of Ganoderma (Ganodermataceae) from the Australasian and pacific regions. Aust Syst Bot 16:487–503.

    Article  Google Scholar 

  • Steyaert RL (1972) Species of Ganoderma and related genera mainly of the Bogor and Leiden Herbaria. Persoonia 7:55–118

    Google Scholar 

  • Thiers BM (continuously updated) Index Herbariorum: a global directory of public herbaria and associated staff. Botanical Garden’s Virtual Herbarium, New York Accessed 11 Aug 2023.

  • Turland NJ, Wiersema JH, Barrie FR, Greuter W, Hawksworth DL, Herendeen PS, Knapp S, Kusber W-H, Li D-Z, Marhold K, May TW, McNeill J, Monro AM, Prado J, Price MJ, Smith GF (eds) (2018) International Code of nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Koeltz Botanical Books, Glashütten.

    Book  Google Scholar 

  • Wagner T, Ryvarden L (2002) Phylogeny and taxonomy of the genus Phylloporia (Hymenochaetales). Mycol Progress 1:105–116.

    Article  Google Scholar 

  • Wu F, Ren G-J, Wang L, Oliveira-Filho JR, Gibertoni TG, Dai Y-C (2019) An updated phylogeny and diversity of Phylloporia (Hymenochaetales): eight new species and keys to the species of the genus. Mycol Progress 18:615–639.

    Article  Google Scholar 

  • Wu F, Zhou L-W, Vlasák J, Dai Y-C (2022) Global diversity and systematics of Hymenochaetaceae with poroid hymenophore. Fungal Divers 113:1–192.

    Article  Google Scholar 

  • Yombiyeni P, Decock C (2017) Hymenochaetaceae (Hymenochaetales) from the Guineo-Congolian phytochorion: Phylloporia littoralis sp. nov. from coastal vegetation in Gabon, with an identification key to the local species. Plant Ecol Evol 150:160–172.

    Article  Google Scholar 

Download references


The authors thank the curators of B and S herbaria for the loan of types and other materials. MCH gratefully acknowledges financial support received from the Université Catholique de Louvain, Belgium (Scholarship from the Conseil de l’Action Internationale (CAI): Coopération au développement), the University of Guadalajara: Acciones de Internacionalización para Docencia, Formación, Innovación e Investigación 2023, and the CONACYT, Mexico (National Scholarship). MCH and LGD thanks the University of Guadalajara for the support received for doing this research. CD gratefully acknowledges the financial support received from the Belgian State – Belgian Federal Science Policy through the BCCM program, and the Fonds de la Recherche Fondamentale Collective (FRFC # 2.4515.06 and FRFC # 2.4.544.10.F).

Adherence to national and international regulations

Not applicable.


Université Catholique de Louvain, Belgium, CONACyT and Universidad de Guadalajara, Mexico, Belgian State – Belgian Federal Science Policy and the Fonds de la Recherche Fondamentale Collective, Belgium.

Author information

Authors and Affiliations



CD and MCH realised the typification problem. CD, MCH, MA, and LGD were involved in drafting the manuscript. PK and JAGB critically revised the manuscript and the nomenclatural issues. CD and MCH made the micromorphological observations. CD made the description of the type specimens. All authors reviewed and approved the final version of the manuscript.

Corresponding authors

Correspondence to Milay Cabarroi-Hernández or Laura Guzmán-Dávalos.

Ethics declarations

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Decock, C., Cabarroi-Hernández, M., Guzmán-Dávalos, L. et al. Fomes weberianus, 50 years of taxonomic confusion: lectotypification and taxonomic notes. IMA Fungus 15, 16 (2024).

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: