Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Aquadiscula |
clavispora |
Fallah & Shearer |
| Class |
Order |
Family |
| Leotiomycetes |
Helotiales |
Helotiaceae |
|
| Synonymy: |
|
Description
|
| Habit: |
On submerged stems of Scirpus atrovirens. |
|
| Ascomata: |
Apothecia 80–250 x 45–70 µm, scattered, grayish white, stipitate; disc 45–60 µm in diam., convex; stipe cylindrical, up to 90 µm high, with darkened base, flexuous. |
|
| Peridium: |
Ectal excipulum of textura globosa, or at times textura angularis, olivaceous to brown, thin walled. Medullary excipulum of textura porrecta, hyaline. |
|
| Beak: |
None. |
|
| Hamathecium: |
Paraphyses 50–70 x 1.5–2.5 µm, hyaline, smooth, mostly branched, at times simple. |
|
| Ascus: |
Asci 44–64 x 4–6 µm, clavate, inoperculate, with broad apex, tapering to a narrow tip, with a pore, thick-walled, MLZ+, with 8 uniseriate or biseriate ascospores |
|
| Ascospore: |
Ascospores 7–10 x 2–3 µm, clavate, guttulate, hyaline, aseptate when young, becoming 1-septate, septum supra median, with a unipolar gelatinous appendage at the basal end; appendage rounded and caducous, not seen in lactic acid. |
|
| Sheath: |
None. |
|
| Appendage: |
Appendages unipolar, gelatinous at the basal end; appendage, rounded and caducous; not seen in lactic acid . |
|
| Culture: |
|
| Anamorph: |
None observed. |
|
Other info
|
| Type & Location: |
HOLOTYPE: USA. WISCONSIN: Vilas Co., Allequash Lake, UTM Zone 16, 296454mE, 5101163mN, 46°2.032ÕN, 89°37.825ÕW, on Scirpus atrovirens, 3 Aug. 1997, PMF & JLC P4-61 (ILLS 53996). |
| Other Specimens: |
|
| Substratum: |
Submerged Scirpus atrovirens. |
| Habitat: |
Lentic. |
| Distribution: |
North America (Wisconsin) |
| Pertinent Literature: |
Fallah & Shearer 2001. |
| Comments: |
See below for pictures; see reference for figure legends. |
Additional Pictures
|
Pictures from protologue.
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