KOH reaction

KOH reaction on Agaricus xanthodermus

Potassium hydroxide 10% drop on A. xanthodermus quickly chrome yellow.

KOH reaction on Russula subfoetens

KOH yellow reaction on stem deemed diagnostic on R. subfoetens vs R. foetens.

KOH reaction on Coriolopsis gallica

KOH black reaction on the flesh of C. gallica.