Name: Marasmius nigrodiscus (Peck) Halling
Most Confident Observations:
Copyright © 2011 Hamilton
Copyright © 2009 Roy Halling (royh)
Copyright © 2019 walt sturgeon (Mycowalt)
Copyright © 2019 walt sturgeon (Mycowalt)
Version: 2
Previous Version 


First person to use this name on MO: Nathan Wilson
Editors: Roy Halling

Nomenclature:

Rank: Species

Status: Accepted

Name: Marasmius nigrodiscus

ICN Identifier: missing

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Author: (Peck) Halling

Citation: Brittonia 35: 323. 1983.

Deprecated Synonyms: Gymnopus nigrodiscus (Peck) Murrill

Classification:

Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Marasmiaceae

Genus: Marasmius

Species: Marasmius nigrodiscus

Lifeform:
Brief Description: [See More | Edit]

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

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