Inocybe aeruginascens is a small
mycorrhizal mushroom with a
conic to
convex cap which becomes plane in age and is often
fibrillose near the margin. It is usually less than 5 cm across, has a slightly darker blunt umbo and an incurved margin when young. The cap color varies from buff to light yellow brown, usually with greenish stains which disappear when the mushroom dries. The gills are
adnate to nearly free, numerous, colored pale brown, grayish brown, or tobacco brown. The
fruit body has greenish tones and bruises blue where damaged. The
spores are smooth and
ellipsoid, measuring 6–9.5 x 4.5
micrometres and forming a clay brown spore print. The stem is 2–7 cm long, 3 to 8 mm thick, and is equal width for the whole length, sometimes with some swelling at the base. It is solid, pale grey, becoming bluish green from the bottom up. The stem is fibrous and appears to be covered with fine powder near the top. It has a partial veil which often disappears in age and an unpleasant soapy odor. ==Distribution and habitat==