Major Groups > Gilled Mushrooms > Pale-Spored > Marasmioid / Collybioid > Marasmius nigrodiscus


Marasmius nigrodiscus

[ Basidiomycetes > Agaricales > Marasmiaceae > Marasmius . . . ]

by Michael Kuo

"That's a Marasmius" is probably not what you'll be thinking when you find Marasmius nigrodiscus for the first time. It is uncharacteristically large for the genus, with a cap that can reach a width of 11 centimeters. It is, however, fairly distinctive, with its dark center and lighter marginal area, and it appears in a wide variety of eastern North American ecosystems--from pine plantations to hardwood forests.


Ecology: Saprobic on litter under hardwoods or conifers; growing alone or, more often, gregariously; summer and fall; apparently limited to eastern North America.

Cap: 3-11 cm; convex becoming planoconvex or nearly flat, usually with a broad central bump or nipple; dry; often becoming somewhat pitted or wrinkled with maturity and developing fine lines along the margin; when young pale brown, becoming creamy white or very pale brownish with a darker brown or reddish brown center; in old age sometimes uniformly pale brownish or dirty cream.

Gills: Broadly to narrowly attached to the stem; close or nearly distant; whitish, sometimes discoloring grayish.

Stem: 4.5-15 cm long; about 1 cm thick; tough; equal; dry; straight; whitish or very pale brownish; bald or finely silky; smooth or with shallow longitudinal grooves; basal mycelium white.

Flesh: Whitish; thin.

Odor and Taste: Tatse mild or slightly bitter; odor not distinctive or faintly of almonds.

Chemical Reactions: KOH negative to grayish or brownish on cap surface.

Spore Print: White.

Microscopic Features: Spores 7-9 x 3-5 µ; smooth; more or less elliptical; inamyloid. Pleurocystidia abundant; fusoid-ventricose; to 120 x 18 µ. Cheilocystidia cylindric, fusiform, or clavate; to 65 x 15 µ. Pileipellis hymeniform. Trama dextrinoid. Caulocystidia filamentous with subclavate to cylindric apices; to about 75 x 10 µ.

REFERENCES: (Peck, 1897) Halling, 1983. (Saccardo, 1899; Halling, 1983; Weber & Smith, 1985; Roody, 2003.) Herb. Kuo 07010302, 07230407, 08030402, 08310504, 06210801, 06230901.

This site contains no information about the edibility or toxicity of mushrooms.


Marasmius nigrodiscus

Marasmius nigrodiscus

Marasmius nigrodiscus
Spore print

Marasmius nigrodiscus

Marasmius nigrodiscus

Marasmius nigrodiscus

Marasmius nigrodiscus

© MushroomExpert.Com

Cite this page as:

Kuo, M. (2012, July). Marasmius nigrodiscus. Retrieved from the MushroomExpert.Com Web site: