96 NEW YORK STATE MUSEUM 



smaller than those of Psilocybe semilanceata caerul- 

 e s c e n s Cke. which has the stem slightly bluish at the base. 



Psilocybe arenulina Pk. 



SANDY PSILOCYBE 

 N. Y. State Mus. Rep't 30, p.42 



Pileus convex becoming plane or centrally depressed, rarely um- 

 bonate, glabrous, hygrophanous, dark brown and coarsely striate 

 on the margin when moist, dingy white or whitish when dry ; lamellae 

 close, adnate, cinnamon brown becoming darker or purplish brown; 

 stem slightly tapering upward, hollow, often radicating and some- 

 what clavate at the base, whitish; spores ellipsoid, 10-12 x 5-6 /x. 



Pileus 1-3 cm broad; stem 3-5 cm long, 1.5-2 mm thick. 



Gregarious. Sandy soil. Albany co. September and October. 

 Rare. 



When moist the pileus has a peculiar radiate appearance as if dis- 

 tinctly striate. Large plants often have the margin of the pileus 

 uneven or wavy and widely sulcate and irregularly striate. A mass 

 of sand usually adheres to the base of the stem. This species is 

 apparently closely related to the European Psilocybe ammo- 

 phi 1 a Mont, from which it may be separated by its hygrophanous 

 pileus which is commonly depressed in the center, rarely umbonate 

 and constantly coarsely striate or sulcately striate both when moist 

 and when dry. Its lamellae also differ, if we may rely upon the 

 descriptions of the lamellae of that species, in having at first a cinna- 

 mon brown color which becomes dark purplish brown with age. 

 They are not made " black pulverulent " by the spores as in P . 

 a m m o p h i 1 a Mont. For these reasons it seems to me far better 

 to consider our plant distinct from the ^^uropean species. 



Psilocybe atomatoides Pk. 



ATOMATE PSILOCYBE 

 N. Y. State Mus. Rep't 29, p.41 

 Pileus thin, fragile, convex or subcampanulate becoming nearly 

 plane, rugosely wrinkled, atomate, slightly and evanescently white 

 floccose, slightly hygrophanous, grayish or ochraceous brown, some- 

 times with a pinkish tint, flesh cinereous ; lamellae moderately broad, 

 subventricose, rounded behind, adnexed, cinereous becoming dark 

 brown ; stem equal, hollow, minutely flocculent when young, pruinose 

 at the top, whitish ; spores blackish brown, 7-8 x 4-5 fi. 



