Freshwater Ascomycetes - Species Monograph

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Genus	Species	Author
Lindgomyces	lemonweirensis	Raja, A.N. Mill. & Shearer
Class	Order	Family
Dothideomycetes	Pleosporales	Lindgomycetaceae

Synonymy:

Description

Habit:

On submerged, decorticated woody debris in a small river.

Ascomata:

Ascomata 218–250 × 295–310 µm, globose to subglobose, papillate, black to brown, scattered or gregarious, immersed to superficial, ostiolate.

Peridium:

Peridium 30–40 µm thick, composed of 2 layers in longitudinal view; inner layer of pseudoparenchyma cells of textura angularis, elongate, compressed or not; outer layer of dark brown cells occluded with brown amorphous material.

Beak:

Papillae short, 40–50 × 60–100 µm, central, composed of dark brown cells.

Hamathecium:

Pseudoparaphyses ca. 100–150 × 4 µm, numerous, septate, hyaline, anastomosing, immersed in gel.

Ascus:

Asci 127–170 × 28–42 µm (av. = 150 × 32 µm, n = 30), fissitunicate, clavate to cymbiform, rounded at the apex, tapering to a 2–3 µm long stipe, with or without an apical chamber.

Ascospore:

Ascospores 30–44 × 10–15 µm (av. = 40 × 13 µm, n = 50), overlapping uni or biseriate, oblong-fusiform, somewhat rounded at the apices, hyaline, one-septate, slightly constricted at the septum, septum close to median (0.46–0.60; av. = 0.50, n = 50); upper cell slightly broader than lower cell, multiguttulate, with a band of small guttules at the septum and at the ascospore apices and a large guttule in each cell; guttules disappear in glycerin and lactic acid; surrounded by an oval gelatinous sheath.

Sheath:

Sheath extends ca. 4–8 µm from the wall of the spore at the septum and ca. 2–3 µm wide at the ascospore apices, ephemeral, not seen when ascospores are mounted in glycerin or lactic acid.

Appendage:

None observed.

Culture:

Anamorph:

None observed.

Other info

Type & Location:

USA, Wisconsin, Lemonweir River, on submerged decorticated wood, 5 October, 2010, 43°46'16" N, 89°53'10"W, Huzefa A. Raja and Andrew N. Miller, A632-1. (ILL 40793, HOLOTYPUS).

Other Specimens:

None.

Substratum:

Submerged decorticated woody debris.

Habitat:

Flowing freshwater stream.

Distribution:

USA: WI

Pertinent Literature:

Raja, H.A., K. Tanaka, K. Hirayama, A. N. Miller and C.A. Shearer. 2011. Freshwater ascomycetes: two new species of Lindgomyces (Lindgomycetaceae, Pleosporales, Dothideomycetes) from Japan and USA. Mycologia 103: 1421–1432.

Comments:

Additional Pictures

Ascospore stained with aqueous nigrosin and fixed in glycerin.
Unstained ascospore.
Ascospore contricted at midseptum.
Asci.
Ascus.
Discharging ascus.
Unstained, unfixed ascospores with gelatinous sheaths.

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