Habitat: West-side old-growth forests.
Conservation Status: Not of concern
The most striking feature of Inocybe olympiana is a microscopic one. It has abundant huge pleurocystidia that turn bright yellow in potassium hydroxide---they look like mountain-islands emerging from a sea of basidia on the gill face. Macroscopically, I. olympiana is a fairly robust, shaggy-scaly, yellow-brown to tawny mushroom. The odor, if present, is faintly farinaceous. The stipe is powdery only at the apex, and has a rounded, often whitish, bulb at the base. The spores are smooth, somewhat irregularly shaped, and 7--9 x 4--5 µm; the cheilocystidia and pleurocystidia are thick-walled and the narrowed apices are encrusted with crystals. The eastern species I. subochracea is smaller, but otherwise very similar, and critical study is needed to assess the relationship between the two species. If only one species is involved, then I. subochracea would have priority.