Psilocybe caerulipes

Cap: 1-3.5 cm broad. Obtusely conic, becomingconic-campanulate to broadly convex to plane with age, and may retain aslight umbo. Margin incurved at first, often tinged greenish, veryirregular, closely translucent-striate, and decorated at first withfibrillose veil remnants. Cinnamon brown to dingy brown, hygrophanous,fading to pale ochraceous buff. Surface viscid when moist from agelatinous pellicle, but soon becoming dry and shiny. Flesh thin,pliant, and bluing where bruised. Gills: Attachment adnate tosinuate to uncinate, close to crowded, narrow, with edges remainingwhitish. Colour sordid brown at first, becoming rusty cinnamon. Stem: 30-60 mm long by 2-3 mmthick. Equal to slightly enlarged toward the base. White to buff atfirst, with the lower regions dingy brown at maturity, bluing wherebruised. Surface powdered at the apex, and covered with whitish tograyish fibrils downwards. Flesh stuffed with a pith and solid at firstbut soon becoming tubular. Partial veil thin, cortinate, and forming anevanescent fibrillose annular zone in the superior region of the stem,if at all. Microscopic features: Sporesdark purplish brown in deposit, ellipsoid, 7-10 by 4-5 microns from4-spored basidia. Spores from 2-spored basidia are larger.Plaurocystidia absent. Cheilocystidia 18-35 by 4.5-7.5 microns,lageniform, with a thin neck, sometimes forked, 1-2.5 microns broad atapices. Habit, habitat, and distribution:Solitary to cespitose on hardwood slash and debris, and on or aboutdecaying hardwood logs (particularly birch, beech, and maple),especially along river systems. Growing in the summer to fall afterwarm rains. Widely distributed east of the Great Plains, throughout theMidwestern and eastern United States. Surprisingly, Guzman made twocollections of this species in Mexico: the state of Hidalgo andsoutheastern Zacualtipan.