Inocybe geophylla

White Fibercap

POISONOUS: contains muscarine. A small, silky white mushroom with a conical to umbonate cap, gills that turn from whitish to grayish brown, and a dull brown spore print. It is one of the most commonly collected white Inocybe species and is easily mistaken for small edible white mushrooms.

Species profile

Edibility: Deadly
Poisonous; First Nature calls it deadly. Contains muscarine: heavy salivation, sweating and tearing within 15-30 minutes, and in larger doses abdominal pain, nausea, diarrhea, blurred vision and labored breathing. Deaths of healthy adults are not reported, but people with heart or respiratory problems are at much greater risk. Atropine is the antidote. Do not eat. Confused with Calocybe gambosa, small Tricholoma and white waxy caps; its brown spore print separates it.

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Characteristics

Cap: 1-4 cm, conical becoming bell-shaped or convex with an umbo; dry, silky, white to cream; margin often splitting. Gills: adnexed or notched, close, whitish becoming grayish brown to medium brown; covered by a white cortina when young. Stem: 1-6 cm long, up to 0.5 cm thick, silky, whitish, with a small basal bulb; no ring. Odor: spermatic or earthy, sometimes indistinct. Spore print: dull brown. Spores: 8-10 x 4.5-6 um, roughly elliptical, smooth. Cystidia: thick-walled, apically encrusted, fusoid (MushroomExpert).