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Micromphale perforans

[ Basidiomycetes > Agaricales > Marasmiaceae > Micromphale . . . ]

by Michael Kuo

Yet another tiny marasmioid mushroom with a whitish to brownish cap, Micromphale perforans distinguishes itself by arising from the fallen needles of conifers (usually needles of spruces; sometimes those of pines). It also smells bad. Not garlicky or oniony, like some of its marasmioid brethren, but foul and reminiscent of rotten cabbage. Microscopic features--which should be checked for positive identification--include inamyloid, ellipsoid to pip-shaped spores, a lack of notable cystidia, and a pileipellis arranged as a cutis of elements with slightly incrusted walls.

Description:

Ecology: Saprobic; arising from the fallen needles of spruces, firs and, less often, pines; growing scattered or gregariously; summer and fall; widely distributed in North America.

Cap: 4-17 mm across; convex, becoming broadly convex or broadly bell-shaped but often developing a central depression and/or bump; dry; bald; sometimes becoming slightly wrinkled or ribbed; pale brown when very young but often fading to buff or nearly white.

Gills: Narrowly or broadly attached to the stem--or occasionally attached by means of a "collar" that encircles the stem; distant or nearly so; buff to whitish.

Stem: Up to 40 mm long; 0.5-1 mm thick; equal; dry; finely hairy to finely velvety (more so toward the base); pale at the apex, but brown to dark brown, reddish brown, or nearly black below.

Flesh: Thin; insubstantial; whitish to brownish.

Odor and Taste: Odor usually unpleasant (reminiscent of rotten cabbage) but sometimes faint or lacking; taste similar, or not distinctive.

Chemical Reactions: KOH negative on cap surface.

Spore Print: White.

Microscopic Features: Spores 6-9.5 x 3.5-5 µ; smooth; pip-shaped or ellipsoid; inamyloid. Pleuro- and cheilocystidia absent--or if present basidiole-like, inconspicuous, and not projecting. Pileipellis a cutis of hyaline to brownish hyphae 3-6 µ wide, with occasionally encrusted walls; sometimes partially gelatinized.

REFERENCES: (Hoffmann, 1789) Gray, 1821. (Fries, 1821; Saccardo, 1887; Breitenbach & Kränzlin, 1991; Noordeloos, 1995; Knudsen & Vesterholt, 2008; Trudell & Ammirati, 2009.) Herb. Kuo 08051001.

The name of this fungus should probably be Gymnopus perforans; Noordeloos & Antonin (2008) have made an official combination into Gymnopus in anticipation of a revised monograph of marasmioid and collybioid mushrooms in Europe which, to my knowledge, has not yet been released.

 

Micromphale perforans

Micromphale perforans

Micromphale perforans

Micromphale perforans
Pileipellis elements

Micromphale perforans
Spores



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Cite this page as:

Kuo, M. (2013, January). Micromphale perforanss. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/micromphale_perforans.html