Name: Agaricus subrufescens Peck
Most Confident Observations:
Copyright © 2002 Nathan Wilson (nathan)
Copyright © 2007 Nathan Wilson (nathan)
Copyright © 2002 Nathan Wilson (nathan)
Version: 4
Previous Version 

First person to use this name on MO: Nathan Wilson
Editors: Alan Rockefeller, Erlon Bailey, Joseph D. Cohen


Rank: Species

Status: Accepted

Name: Agaricus subrufescens

ICN Identifier: missing

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Author: Peck

Citation: Ann. Rep. N.Y. St. Mus. 46: 25 (1894) [1893]

Deprecated Synonyms: Agaricus brasiliensis Wasser et al., Agaricus rufotegulis Nauta, Psalliota subrufescens (Kuntze) Kauffman, Agaricus blazei sensu Heinemann


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Agaricaceae

Genus: Agaricus

Species: Agaricus subrufescens

Brief Description: [See More | Edit]

Cap: 7-25 cm; round, sometimes shaped like a marshmallow when young, becoming convex to nearly flat; surface dry, when young covered with fine matted fibrils which break up into tiny scales, except at the center; fibrils pallid, buff, pale brown, or pinkish-brown; scales becoming darker brown or reddish with age; background color white to pinkish-buff; sometimes yellowing with age or when bruised.

Gills: Free from the stem; close; whitish when young, becoming pinkish, then reddish brown, and eventually dark chocolate brown.

Stem: 5-15 cm long; 1-4 cm thick; equal or enlarged at base; with a thick membranous partial veil which has cottony patches on the underside and which forms a high, skirt-like ring; white to pinkish above the ring; smooth or with fibrils or scales below; base often staining yellow with age or when bruised (but the flesh inside does not stain bright yellow when cut); base often with mycelial threads attached.

Flesh: Thick; firm; white; bruising very slightly yellow or not at all.

Odor and Taste: Like almonds.

Chemical Reactions: Cap yellow with KOH.

Spore Print: Dark brown.

Microscopic Features: Spores 5.5-7.5 × 4-5 µ; elliptical; smooth; inamyloid. Pleurocystidia absent; cheilocystidia 10-15 × 4-5 µ; abundant; inflated.

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