E-Flora BC: Electronic Atlas of the Flora of British Columbia

Psilocybe argentina (Speg.) Singer
no common name

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi
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Distribution of Psilocybe argentina
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Species Information

features include small size, hygrophanous, reddish brown, subviscid to lubricous cap, adnate often mottled gills that are fuscous gray to dull buff or dark violaceous brown, with white edges, whitish or almost cap-colored stem, growth on dung, in grassland, dark purple brown spore deposit, and microscopic characters including angular spores; rare in Pacific Northwest, but found in WA, CA, MI, Mexico, Argentina, Brazil, Colombia, Venezuela, Switzerland; a Paul Kroeger collection from BC is deposited at University of British Columbia
(0.8)1.2-2(2.5)cm across, hemispheric to convex, rarely subumbonate [with slight umbo]; hygrophanous, reddish brown or chestnut brown, fading to brownish yellowish or dark straw; subviscid to lubricous, often slightly shining when dry, bald, margin may be slightly striate when moist
paler than cap to almost the same color, unchanging in color when exposed
broadly adnate; "fuscous gray to dull buff or dark violaceous brown, with white edges", frequently mottled
(1.5)2-4.5(5)cm x (0.13)0.2-0.3cm, equal or eventually somewhat widened at top, hollow; whitish or almost cap-colored or more reddish brown; smooth or slightly fibrillose
arachnoid [cobwebby] white mass when young, but stem without remains when mature
slightly fungoid
slightly fungoid
Microscopic spores:
spores (11)12-15(18.6) x (9)9.6-10.2(12) x 7-8.5 microns, "strongly subhexagonal or subrhomboid in face view", subelliptic in side view, light to dark yellowish brown, thick-walled, with broad truncate germ pore; basidia 4-spored, 24-32 x 10-13 microns, colorless, ventricose subpyriform, [somewhat pear-shaped and wider in middle], sometimes with a slight medial constriction; pleurocystidia absent, cheilocystidia abundant, 22-45 x 4.5-10 microns, colorless, thin-walled, "fusoid-ventricose or sublageniform to lageniform", with long neck 3-8 microns broad "and with obtuse, subglobose to globose apex"
Spore deposit:
dark violaceous brown or dark purple brown

Habitat / Range

Gregarious on cow and horse dung, in grassland, meadows, or outside of the wooded areas, both in shaded or sunny places., fruiting almost all year, but mainly during rainy season

Synonyms and Alternate Names

Psilocybe merdicola Huijsman

Taxonomic and Nomenclatural Links

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General References