276 . THE AGARICACEAE OF MICHIGAN 



out. SPOKES 5-8x4-5.5 micr., oval, somewhat pointed at ends, 

 smooth, reddish-brown under microscope. CYSTIDIA none. 

 STERILE CELLS on edge of gills, slender, lanceolate-subulate, 30- 



34 x 5 micr. 



Gregarious, on the ground in woods. Ann Arbor, Bay View. 

 (Probably throughout the State). June-July. 



Differing from the preceding in the non-viscid pileus and closer 

 gills. Here again two very different spore-sizes have been given, 

 and although Cooke's figure is somewhat illustrative of our plant, 

 his spores are too large, 10-12 x 6 micr. 



Section II. Tenaces. Pileus with a pellicle, moist or subviscid 

 when young; veil slight, cortinate. Toughish and somewhat 

 brightly colored. 



266. Psilocybe canofaciens Cke. 



Grevillea, Vol. 14, p. 1, 1885. 

 Illustration: Cooke, 111., PI. 621. 



PILEUS 1-3 cm. broad, campanulate-convex, then expanded, ob- 

 tuse or subumbonate, even, umber-brown, covered at first by delicate, 

 white, scattered fibrils, at length somewhat appressed fibrillose- 

 scaly and fibrils concolor. FLESH thickish on disk, concolor. 

 GILLS adnate, rather broad, ventricose, subdistant, dark umber. 

 STEM 5-7 cm. long, 2-4 mm. thick, equal or slightly tapering, stuffed 

 then hollow, dark umber-color, darker at base, covered with long 

 fibrils which become matted, toughish. SPORES elliptical-oblong, 

 slightly curved in one plane, very variable in size, 10-15 micr. long 

 (rarely much longer), 4-5 micr. thick, purple-brown under micro- 

 scope, umber in mass. 



On the ground in woods. Negaunee. August. Rare. 



Sent to me by Miss Rose M. Taylor. It is a very characteristic 

 plant, with its dark colors, the fibrillose-hairy covering on the cap 

 and stem and the variable spore-size. This plant is a striking com- 

 mentary on the value of spore-characters iu identification. Massee 

 (British Fungus Flora) states that the spores vary very much 

 in size in the English specimens, and in Michigan this peculiar- 

 ity is also found. 



