The red staining, silky brown cap, large
size, and dedication to Monterey Cypress define this beautiful mushroom, which
is reminiscent of several eastern species, including Agaricus haemorrhoidarius
and Agaricus silvaticus. Unlike its eastern counterparts, however, Agaricus
fuscofibrillosus does not typically become prominently scaly with maturity; its
pressed-down fibers tend to remain tightly affixed to the cap surface.
Description:
Ecology: Saprobic; growing alone,
scattered, or gregariously in piled litter of Monterey Cyprus; sometimes
reported under other coastal trees (including Coast Live Oak); fall and winter;
on the West Coast.
Cap: 5-13 cm; convex, becoming broadly
convex or broadly bell-shaped; dry; covered with brown to reddish brown,
pressed-down fibers that usually remain more or less tightly affixed but occasionally
aggregate into small scales; shiny.
Gills: Free from the stem; close; pink
when young, bruising reddish; later dark chocolate brown to blackish; covered
when in the button stage with a whitish to brownish partial veil.
Stem: 6-14 cm long; up to 3 cm thick;
more or less equal, or slightly enlarged below; with a prominent, skirtlike,
whitish to brownish ring; whitish above the ring and brownish below it;
bruising reddish; fairly smooth or finely hairy.
Flesh: White; changing to red when
sliced.
Odor and Taste: Odor not distinctive or
sweet and fruity; taste similar.
Chemical Reactions: Cap surface negative
with KOH.
Spore Print: Dark chocolate brown.
Microscopic Features: Spores: 4.5-7.5 x
3-5 µ; elliptical. Cheilocystidia up to 22 x 7 µ; clavate to cylindric;
scattered.
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