Agaricus amicosus
Agaricus amicosus is a
common fungal feature of Colorado's high-elevation conifers forests; it is
particularly common under Engelmann Spruce and Subalpine Fir during the late
summer monsoon season.
Physical features
separating Agaricus amicosus from other Rocky Mountain Agaricus species include
the light to medium brown fibers on the cap, the large size, and the
red-staining flesh. Separation from similar species in other areas (including
Agaricus fuscofibrillosus on the West Coast and Agaricus haemorrhoidarius in
the east), in the event high elevation leaves you so light-headed that you
forget you are in the mountains, can be accomplished through chemical and
microscopic analysis (see below).
Description:
Ecology: Saprobic;
growing scattered or gregariously in piled litter of Engelmann Spruce and
Subalpine Fir; summer and fall; documented from southwestern to north-central
Colorado and perhaps to be expected throughout the spruce-fir forests of the
Rocky Mountains.
Cap: 7-18 cm; convex or
blocky at first, becoming broadly convex; dry; whitish underneath brown,
pressed-down fibers that remain tightly affixed or become aggregated into small
scales; often bruising reddish.
Gills: Free from the
stem; close; pink when young, often bruising reddish; later dark chocolate
brown to blackish; covered when in the button stage with a whitish to brownish
partial veil.
Stem: 4-12 cm long; up to
3 cm thick; more or less equal above a slightly to moderately swollen base;
with a skirtlike, whitish to brownish ring; whitish; bruising reddish orange;
fairly smooth; base sheathed in whitish to brownish veil material.
Flesh: White; changing to
reddish or brownish red when sliced.
Odor and Taste: Odor not
distinctive or sweet and fruity; taste similar.
Chemical Reactions: Cap
surface sometimes (but not always) yellow with KOH.
Spore Print: Dark
chocolate brown.
Microscopic Features:
Spores: 5-8 x 4.5-6 µ; elliptical. Cheilocystidia up to 30 x 12 µ; clavate to
cylindric.
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