Major Groups > Gilled Mushrooms > Dark-Spored > Stropharia, Leratiomyces & Psilocybe > Stropharia ambigua

MushroomExpert.Com

Stropharia ambigua

[ Basidiomycota > Agaricales > Strophariaceae > Stropharia. . . ]

by Michael Kuo

The folks on the West Coast are bored with Stropharia ambigua, but for a Midwesterner on a winter (!) mushroom vacation it's about the coolest thing going. It's huge, bright yellow, slimy, and adorned with drooping white partial veil remnants. What more could you ask for in a mushroom?

So when my California friends tell me that Stropharia ambigua is a mushroom "weed" in coastal areas, I compare it with the thoroughly non-thrilling Stropharia hardii, which is the closest look-alike back east, and I wish that Hamlet had been right, and that the whole world could be "an unweeded mushroom garden, grown to seed." Yeah, I threw a word in there.

Description:

Ecology: Saprobic; growing alone or gregariously on woody debris in conifer and (sometimes) hardwood forests, or in wood-chip beds; fall through spring; West Coast. The illustrated and described collections are from California and Alaska.

Cap: 3–14 cm; hemispheric to convex at first, becoming broadly convex or nearly flat; slimy when fresh; yellow to brownish yellow or pale yellow; bald; the margin adorned with hanging white partial veil remnants, especially when young.

Gills: Attached to the stem or beginning to pull away from it; close; whitish to very pale gray at first, becoming purplish gray to purple-black; with whitish edges when mature.

Stem: 6–16 cm long; 1–2 cm thick; equal; dry; with a ring or ring zone that may disappear; bald above the ring and finely shaggy below it; basal mycelium white; base often with white mycelial threads.

Flesh: White; unchanging when sliced.

Odor: Not distinctive, or somewhat radishlike to mealy.

Spore Print: Dark purple-brown to blackish.

Chemical Reactions: KOH on cap surface pale orange.

Microscopic Features: Spores 11–16 x 6–8 µm; ellipsoid; with a large pore at one end; smooth; thick-walled; brown in KOH. Basidia 4-sterigmate. Pleuro-chrysocystidia 30–50 x 10–15 µm; clavate, or clavate with a narrowed, angular apex; smooth; thin-walled; hyaline; inclusions small, globular, and golden-refractive. Cheilo-chrysocystidia not found. Lepto-cheilocystidia present; basidiole-like. Lamellar trama parallel. Pileipellis an ixocutis; elements poorly defined, hyaline to golden in KOH, 2.5–5 µm wide.


REFERENCES: (Peck, 1898) Zeller, 1914. (Saccardo, 1902; Stamets, 1978; Smith, Smith & Weber, 1979; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Trudell & Ammirati, 2009; Kuo & Methven, 2010; Desjardin, Wood & Stevens, 2015; Siegel & Schwarz, 2016.) Herb. Kuo 01130523, 01141101. Herb. MICH 53398.


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

 

Stropharia ambigua

Stropharia ambigua

Stropharia ambigua

Stropharia ambigua

Stropharia ambigua
Spores

Stropharia ambigua
Pleuro-chrysocystidium

Stropharia ambigua
Pleuro-chrysocystidium and spores

Stropharia ambigua
Pileipellis



© MushroomExpert.Com



Cite this page as:

Kuo, M. (2017, May). Stropharia ambigua. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/stropharia_ambigua.html