Freshwater Ascomycetes - Species Monograph

Click on the pictures below to view them at their full size.

Genus	Species	Author
Physalospora	limnetica	Raja & Shearer
Class	Order	Family

Synonymy:

Description

Habit:

Ascomata scattered, immersed to partly immersed, becoming erumpent on submerged herbaceous debris.

Ascomata:

Ascomata 470–490 × 400–450 µm, scattered, immersed to partially immersed, becoming erumpent, ostiolate, globose to subglobose, membranous, dark brown to black, papillate.

Peridium:

Peridium 20–30 µm wide, composed of five to six layers of elongated pseudoparenchymatic cells; dark toward the outside, pale brown to hyaline toward the inside; cells ca. 10–15 × 2–4 µm.

Beak:

Papillae 80–100 × 100–130 µm, conical, wall of papillae composed of dark brown outwardly diverging hyphae, periphysate; periphyses thin-walled, hyaline, septate.

Hamathecium:

Paraphyses abundant, simple, septate, immersed in a gel matrix, broad at the base and narrowing toward the apex, extending above the asci, tips of the paraphyses staining blue in aqueous nigrosin.

Ascus:

Asci 145–190 × 16-–20 µm, cylindro-clavate, unitunicate, with a small bipartite, nonamyloid apical ring that stains blue in aqueous nigrosin; ascus flattened at the apex, tapering to a short stalk at the base, with eight overlapping uniseriate ascospores.

Ascospore:

Ascospores 18–22 × 9–14 µm, aseptate, rhomboid when young, becoming subglobose to oval when mature, hyaline, multiguttulate, surrounded by a gelatinous sheath.

Sheath:

Sheath ca. 3–4 µm wide, staining blue in aqueous nigrosin, enlarging in water to ca. 10–15 µm wide.

Appendage:

None observed.

Culture:

Colonies on CMA hyaline, producing a pink pigment that diffuses into the surrounding agar. Aerial mycelium white, floccose, immersed hyphae creamy yellow; composed of branched, septate, hyaline hyphae.

Anamorph:

None observed.

Other info

Type & Location:

TYPE. USA. FLORIDA: Apalachicola National Forest, Camel Pond, 30°16_36_N, 84°59_20_W, water 33 C, pH 5.5, on submerged herbaceous debris, 10 Jul 2006, HAR and JLC, F108-1. (ILL40115).

Other Specimens:

Substratum:

Submerged herbaceous debris.

Habitat:

Lentic, pond.

Distribution:

USA (FL)

Pertinent Literature:

Raja & Shearer 2008.

Comments:

See above reference.

Additional Pictures

Back