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Table 1 Comparison of the morphological features of the different Geolegnia species.

From: Incipient loss of flagella in the genus Geolegnia: the emergence of a new clade within Leptolegnia?

  G. helicoides G. inflata G. intermedia G. septisporangia
Zoosporangial shape Cylindrical to broadly filiform, fusiform; tapering to the apex; straight, usually curved, bent or somewhat sinuous Cylindrical to filiform at first, becoming swollen at intervals (spores inside expanded portions), in its typical catenulate aspect Cylindrical to filiform, becoming swollen at intervals (spores inside expanded portions) Cylindrical to filiform, curved to somewhat sinuous
Zoosporangial size (µm) (150–)190–600(–800) × 10–20 70–380(–655) × 8–29 As in G. inflata 38–187 × 10–24
Spores shape Non-motile. Cylindrical, fusiform, or broadly ellipsoidal, infrequently to rarely oval Non-motile. Spherical-oval, ovate; seldom elongate; formed in a single row Non-motile. Spherical-oval, ovate; seldom elongate Non-motile. Cylindircal, fusiform, or broadly ellipsoidal; rarely oval
Oogonial wall Smooth, thin; unpitted (very rarely with a lateral papillate projection) Smooth, thin; unpitted Smooth, thin; unpitted Smooth, thin; unpitted
Antheridial branches Androgynous, mainly diclinous, often monoclinous, forming helicoidal spirals about the oogonial stalk, and extensively wrapping about themselves and around adjacent hyphae; slender, irregular; very branched; persisting Mainly androgynous, infrequent. monoclinous, (diclinous); slender, irregular; unbranched or once-branched; persisting As in G. inflata Mainly androgynous, adjacent to oogonia; rarely monoclinous; slender, twisted; unbranched or once-branched; persisting
Oogonial shape Spherical—subglobose, sometimes obpyriform, pyriform, or very rarely oval or irregular; often immature and proliferating Spherical-subspherical, obpyriform As in G. inflata Spherical to obpyriform
Oogonial diam (µm) (25–)30–l5 (14–)18–22(–33) As in G. inflata or larger (15–)24–30(–38)
Oospore type Subeccentric; hyaline or brownish, thin-walled, contents finely granular. Oospheres almost always not maturing inside normal oogonia Eccentric; Oospheres almost always maturing inside normal oogonia Eccentric; Oospheres almost always maturing inside normal oogonia Eccentric; Oospheres almost always maturing inside normal oogonia
Oospore diam (µm) (20–)25–35(–42) (13–)15–20(–28) 16–19 (13–)22–29(–36)
Oospores per oogonium Single; spherical or ellipsoidal, or irregular when immature; filling the oogonium Single; spherical; filling the oogonium Single; spherical; filling the oogonium Single; spherical; filling the oogonium
Oogonial stalk Slender and short or stout and longer; often straight, bent, twisted or curved; branched and somewhat irregular Slender; curved, bent, twisted and irregular, unbranched or once-branched Slender; curved, bent, twisted and irregular, unbranched or once-branched Slender, straight, curved, or somewhat irregular; unbranched
Gemmae Very rare; cylindrical, fusiform, irregular, or branched; terminal or intercalary, single or catenulate Lacking Lacking Very rare; clavate-obpyriform; single, terminal