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Floccularia fusca

[ Basidiomycetes > Agaricales > Tricholomataceae > Floccularia . . . ]

by Michael Kuo

Apparently limited to the spruce-fir elevations of the central and southern Rocky Mountains, Floccularia fusca is recognized by its grayish brown cap, which features a zone of white partial veil remnants along the edge; its white spore print and gills; its stem, which is sheathed in whitish shagginess; and its smooth, amyloid spores.

Though the authors of the species (Mitchel & Smith, 1976) stress the absence of yellow shades on Floccularia fusca, yellowish discoloration on the lower stem is not uncommon, to judge from my collections and those of Roger Phillips (follow the link below).

Description:

Ecology: Assumed to be mycorrhizal (but I have the slightest of doubts, since its fruiting pattern tends to be rather like that of the faux-terrestrial, saprobic species of Armillaria that fruit from buried wood); terrestrial under Engelmann Spruce and Subalpine Fir; often growing alone, but sometimes scattered; summer and fall; central and southern Rocky Mountains.

Cap: 4-7 cm; convex when young, becoming planoconvex or flat; moist; smooth at first but developing radial, pressed-down fibers with age; grayish brown (ranging in intensity from nearly black to nearly white); the edge adorned with white partial veil remnants.

Gills: Attached to the stem; close; white or pale grayish.

Stem: 6-7 cm long; up to 1.5 cm thick; more or less equal; white and smooth near the apex; sheathed below with shaggy zones of soft white scales; sometimes with a poorly defined ring; often developing yellowish discolorations in the basal half.

Flesh: White; not changing on exposure.

Taste: Not distinctive; odor not distinctive.

Spore Print: White.

Chemical Reactions: KOH and iron salts on cap surface negative.

Microscopic Features: Spores 5-9 x 4-5 µ; smooth; elliptical; amyloid.

REFERENCES: (Mitchel & Smith, 1976) Bon, 1990. (Mitchel & Smith, 1976; Smith, Smith & Weber, 1979; Phillips, 1991/2005.) Herb. Kuo 08080505.

Further Online Information:

Armillaria fusca at Roger's Mushrooms

 

Floccularia fusca

Floccularia fusca

Floccularia fusca



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Cite this page as:

Kuo, M. (2006, October). Floccularia fusca. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/floccularia_fusca.html