Description: Psilocybe semiinconspicua is a psilocybin mushroom in section Semilanceatae native to the state of Washington in the United States. The mushroom is small, rare, difficult to see and stains blue where damaged. It can be mistaken for Psilocybe silvatica and can be distinguished by its more conic cap, narrower spores and narrower cheilocystidia.
This mushroom is only known from the type locality where it was found at the Glacier Peak Wilderness Area in Wentachee National Forest, Washington, USA.

Macroscopic feat.:

• Cap/Pileus: 7-12 mm and convex, becoming nearly plane in age. It is hygrophanous, has a smooth surface, and is olive black when moist, fading to brownish orange or dark reddish brown as it dries.
• Gills/Lamellae: The gills are Adnate light grayish brown at first, turning dark purple as the spores mature.
• Stem/Stipe: 15-20 x 2 mm, hollow, has an equal width, and is white with whitish or brownish floccose scales, drying to a reddish brown. It stains blue near the base.

Microscopic feat.:

• Basidio/Spores: 8-10 x 5,7 µm, subovoid to ellipsoid, thick-walled, and yellowish brown to dark purple brown in deposit.
• Basidia: 4-spored.
• Cheilocystidia: Sublageniform and 24-30 x 6-8 µm. No pleurocystidia have been observed. Clamp connections are present.

Habitat: Gregarious in small groups among shrubs on a creek bank.

source - www.wikipedia.org

Pictures at www.mushroomobserver.org