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 |