Freshwater Ascomycetes - Species Monograph

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Genus	Species	Author
Nais	inornata	Kohlm.
Class	Order	Family
Sordariomycetes	Halosphaeriales

Synonymy:

Description

Habit:

Black, globose venter immersed in submerged wood or in the empty ascomata of other species of ascomycetes on submerged wood; necks light, emergent.

Ascomata:

Perithecia scattered, venter immersed, sometimes partly superficial, globose, black, membranous, 240–500 µm diam., ostiolate, with a long neck.

Peridium:

Peridium of pseudoparenchyma, cells thick-walled, cell walls dark brown.

Beak:

Neck hyaline or sub-hyaline, long, cylindrical, simple or branched, periphysate, 140–1,780 µm long, 25–50 (–69) µm wide at base, tapering to 24–36 (–43 µm wide at apex.

Hamathecium:

At first containing hyaline, thin-walled, pseudoparenchymatic cells, at maturity consisting of only a basal layer of asci or asci and catenophyses. Catenophyses hyaline, pseudoparenchymatic, simple or branched, with an apical, basal or lateral attachment.

Ascus:

Asci unitunicate, clavate, 8-spored, thin walled, somewhat stipitate, evanescent at maturity, 80–150 x 20–35µm.

Ascospore:

Ascospores ellipsoidal, 1-septate, hyaline, with or without constriction at the septum, with inner wall ornamentations in a band at septum and at each end, oil droplets characteristically accumulating in the regions of wall ornamentation, (19.2–) 21.6–26.4 (–29) x 9.6–14.4 µm.