Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Roussoella |
intermedia |
Y.-M. Ju, J.D. Rogers, & Huhndorf, Mycotaxon 58: 447. 1996. |
| Class |
Order |
Family |
| Sordariomycetes |
Melanommatales |
Didymosphaeriaceae |
|
| Synonymy: |
|
Description
|
| Habit: |
On woody substrates. |
|
| Ascomata: |
Ascomata 190–195 x 168–176 µm, immersed, becoming partially erumpent, gregarious and in rows, surrounded by stromatic tissue, dark brown, globose to broadly obpyriform, with clypeus covering the ostiole; clypeus slightly raised, dark brown |
|
| Peridium: |
Peridium 17–19.5 µm thick, composed of compressed hyaline cell layers; cells thickened and darkened toward the apex. |
|
| Beak: |
Beak 54.5–58.5 x 39–47 µm, central, periphysate. |
|
| Hamathecium: |
Pseudoparaphyses trabeculate, 1–2 µm wide, embedded in a gelatinous matrix, branched and anastomosing above the asci. |
|
| Ascus: |
Asci 76–98 x 8–10 µm, broadly cylindrical, with rounded apex, persistent, narrowing to a short hoof-shaped stipe, fissitunicate, with small ocular chamber seen when mounted in 5% KOH, containing eight overlapping uniseriate ascospores. |
|
| Ascospore: |
Ascospores 12–15 (-16) x 4–6 µm (x= 13.5 x 5 µm), fusiform-ellipsoid, brown, 1-septate, slightly constricted at the septum, mostly with rounded ends, with longitudinal striations of less than 1 µm wide. |
|
| Sheath: |
None found. |
|
| Appendage: |
None found. |
|
| Culture: |
|
| Anamorph: |
|
|
Other info
|
| Type & Location: |
|
| Other Specimens: |
Trout Lake, UTM Zone 16, 293196mE, 5098921mN, 46°00.838ÕN, 89°40.283ÕW, on submerged, partially decomposed bark, 14 Nov. 1997, PMF & JLC P1-109 ( ILLS 54062). |
| Substratum: |
Woody substrates. |
| Habitat: |
Mostly terrestrial. |
| Distribution: |
North America (Wisconsin), tropical South East Asia |
| Pertinent Literature: |
Fallah & Shearer 2001. |
| Comments: |
See Fallah & Shearer 2001. |
Additional Pictures
|
Fig. 1, Bar = 50 µm; Figs. 2–8, Bar = 25 µm; Fig. 9, Bar = 12.5 µµ
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