Freshwater Ascomycetes - Species Monograph

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Genus	Species	Author
Chaetomium	globosum	Fries, Mykol. Hefte 1: 16. 1817. Syst. Myc. Fung. 3: 225. 1829
Class	Order	Family
Sordariomycetes	Sordariales

Synonymy:

For a list of synonyms see Arx et al 1986.

Description

Habit:

Saprobic on submerged, decomposed stems of Carex oligosperma.

Ascomata:

Ascomata 280–355 x 230–285 µm, superficial, scattered, globose or subglobose, at times ovate, covered with greyish-brown hairs; hairs mostly of two types: towards the apex and around the ostiole dark brown, unbranched, septate, straight, with coiled end, 5–6 µm thick at the base, warted; toward the base hairs mostly light brown, unbranched, at times smooth, 1.5–2.5 µm thick, wavy; ascomata ostiolate; ostiole 30–35 µm in diam..

Peridium:

Peridium 19–28 µm thick, composed of 3 or 4 layers of pseudoparenchymatic cells; cells in surface view of textura intricata, in median longitudinal section of textura angularis, 8–18 x 4–6.5 µm, smaller and globose around the ostiole.

Beak:

Hamathecium:

Paraphyses evanescent at maturity, filamentous when young.

Ascus:

Asci 40–50 x 10–12 µm, clavate, narrowing to a slender stipe, unitunicate, evanescent, fasciculate, 8-spored.

Ascospore:

Ascospores 8–10 x 5.5–8 µm, limoniform, subapiculate, at times appearing compressed when viewed from the side.

Sheath:

None observed.

Appendage:

None observed.

Culture:

Anamorph:

Other info

Type & Location:

Other Specimens:

Substratum:

1. Dead stem of Carex oligosperma.

Habitat:

1. Crystal Lake Bog.

Distribution:

1. USA (WI)

Pertinent Literature:

1. Fallah & Shearer 2001.

Comments:

Additional Pictures

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