Freshwater Ascomycetes - Species Monograph

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Genus	Species	Author
Ascotaiwania	pallida	K. D. Hyde & Goh
Class	Order	Family
Sordariomycetes	Xylariales	Amphisphaeriaceae

Synonymy:

Description

Habit:

Superficial on submerged wood.

Ascomata:

Ascomata 106-312 µm in diam., 220-460 µm high, globose or subglobose, mostly superficial, brown to black, coriaceous, perpendicular or horizontal to the host surface, papillate, aperiphysate, solitary or gregarious.

Peridium:

Peridium 12- 19 µm wide at the base, comprising textura intricata, hyaline at the inside and brown outwardly, fusing at the outside with the host cells, becoming wider and dark brown above, 25-37.5 µm wide composed of brown thick walled textura angularis.

Beak:

Not present.

Hamathecium:

Paraphyses up to 6 µm at the base, filamentous, septate, tapering, not in a gelatinous matrix.

Ascus:

Asci 112-130 x 7.5-8.5 µm, 8-spored, cylindrical, unitunicate, pedicellate, apically rounded, with a refractive apical ring, 5-6 µm diam., 3.5-4.5 µm high.

Ascospore:

Ascospores 16-25 x 5-7 µm, uniseriate, (2-)3(-5)-septate, slightly constructed at the septa, yellow or light brown, end cells lighter in color, smooth-walled.

Sheath:

Not present.

Appendage:

Not present.

Culture:

on PDA very slow-growing, reaching 5mm diam. in 1 yr. Mycelium mostly immersed although cottony and hyaline in the center, tan colored from above, brown in the center, pale brown from below, not sporulating in culture even after one year.

Anamorph:

Unknown.

Other info

Type & Location:

U.K. Gloucestershire, nr Cheltenham, Chedworth Woods, River Coln, on submerged wood, 1 Sep 1996, K. D. Hyde, Eng 12 (HKU(M) 3247 (holotype), 3248, 3249, 3250 (paratypes).

Other Specimens:

Substratum:

Submerged wood

Habitat:

lotic (river)

Distribution:

U.K.

Pertinent Literature:

Hyde & Goh 1999a

Comments:

See World Report for additional information.

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