Macroscopic feat.:

• Cap/Pileus: 20-40+ mm in diameter, convex to broadly convex to plane at maturity. Very light brown maturing to light yellow to grayish white upon drying. Surface viscid. Flesh white soon bruising bluish green.
• Stem/Stipe: 30-70+ mm in length, yellowish. Flesh dramatically bruising bluish green where injured. Partial veil cortinate sometimes leaving an annular zone.
• Gills/Lamellae: Attachment adnate to adnexed. Grayish coloration in young fruit bodies becoming purplish brown in maturity.

Microscopic feat.:

• Basidio/Spores: 10.5 -12.5 (13.5) µm in length, ellipsoid, dark purplish brown in deposit. Slightly larger than Psilocybe cyanescens spores (9-12 µm.).

Habitat: Wood debris, landscaped areas.

Comment: Psilocybe cyanofranciscana is a newly acknowledged species in the California Bay Area and has not yet been officially described. The name "Psilocybe cyanofranciscana" is provisional and probably won't be retained upon publication in a scientific journal
Stamets (2005) coined the name "Cyclone" Psilocybe to describe the cyclonic (swirled) growth of the mycelium on agar, a feature often not present. This is possibly an introduced species that appears to be aggressively spreading and perhaps displacing its close relative, Psilocybe cyanescens, but there is also evidence that this species has been present in San Francisco since at least 1975 (Duffy and Vergeer, 1977). Microscopically Psilocybe cyanofranciscana and Psilocybe cyanescens are virtually indistinguishable but the mushrooms are easily separated in the field based on macroscopic features. Psilocybe cyanofranciscana is typically larger, more squat, paler in coloration, and lacks the wavy cap margin, especially when young, of Psilocybe cyanescens. Superficially, Psilocybe cyanofranciscana resembles the smaller Psilocybe cyanofibrillosa, but the microscopic features do not agree and it doesn't appear to be closely related.

source - www.sporeworks.com

Pictures at www.mushroomobserver.org