Psilocybe cyanofibrillosa
An uncommon Pacific Northwest psilocybin mushroom that fruits from September to December in wood-enriched soil, bark mulch and alder chips, including rhododendron gardens and estuary flood plains. It is close to P. cyanescens and P. subfimetaria and grows on wood chips in the same way. It contains psilocybin, which is a controlled substance in many countries; check local law before cultivating.
Where it grows wild
Soil rich in deciduous wood debris, alder and willow chips, bark mulch and fir sawdust, in coastal areas, nurseries and river estuaries.
Few records carry an elevation; it is a coastal lowland species.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 3.0 licence, unmodified.