Psilocybe subaeruginascens

A species of Psilocybe.

The mushroom cap ranges from 1 to 6 cm, exhibiting a shape from conical to convex, and is tan-brown and hygrophanous. Its margin appears striate when wet, and it frequently features a prominent umbo. Damage to the cap results in bluish bruising. The gills are densely packed, occasionally bifurcated, and subtly mottled; they are creamy when young, transitioning to violet-brown with age, and display an adnate to adnexed, sometimes subdecurrent, attachment. The spores are dark violet-brown, rhomboid to subrhomboid to subellipsoid, measuring 7.5-12 x 6.5-8.5 µm. The stipe, 2.5 to 6.5 cm long and 0.2 to 0.3 cm thick, is white to gray, finely striate, and either uniform in thickness or slightly broader near the base. A well-developed partial veil forms a durable, membranous annulus on the upper part of the stem. Damage to the stipe also causes it to bruise blue. Both the taste and odor are described as farinaceous.