July 1907] North American Species o/ Agaricaceae 163 



25. PSATHYRA TIGRINA Patouillard, Bull. Soc 

 Myc. 1899. 



Pileus at first ovoid, white, covered with brown or blackish 

 scales, afterward campanulate, smooth or scarcely striatulate and 

 villous, finally diffluent and purple-brown. Stipe cylindric, slen- 

 der, fragile, white. Lamellae linear, whitish, afterwards becom- 

 ing purple; spores purple, ovoid, 7-10 x 5-8 mic. 



Growing on rotten trunks, Guadaloupe, Duss. Plant 3-5, 

 cm. high; related to Ps. gyroflexa. 



26. PSATHVRA VESTITA Peck, N. Y. Rep. 1905.. 



Pileus submembranaceous, ovoid, conic or sub-campanulate'^ 

 obtuse, rufescent, when young clothed with white floccose fibrils,'^ 

 soon paler or white and silky-fibrillose. Stipe equal, flexuousi 

 hollow, fibrillose, white. Lamellae narrow, close, adnate, at first, 

 white, becoming blackish-brown; spores purplish-brown elliptic 

 8-10x5-6 mic. ' ' 



Growing among fallen leaves and grass. New York, Peck. 

 Pileus 1-1.5 cm. in diameter; stipe 2.5-4 cm. long. 2-3 mm! thick! 



2^. PSATHYRA ATOMATOIDES, A. (Psilocybe) 



ATOMATOIDES PeCK, 29 N. Y. ReP. 1876. 



Pileus rather thin, fragile, subcampanulate or convex then 

 expanded, rugulose, subhygrophanous, atomate, grayish or och- 

 raceous-brown, at first clothed with tufts of white flocci, which 

 are fugacious. Stipe equal, fistulous, when young minutely floc- 

 cose-scaly, pruinose at the summit, whitish. Lamellae rather 

 broad, subventricose, rounded behind, cinereous then dark brown ; 

 spores subelliptic, blackish-brown, 7-8 X4 mic. 



Growing on the ground and on decaying wood under pine 

 and hemlock trees. New York, Peck. Pileus 1.5-2.5 cm. ins 

 diameter ; stipe 4-5 cm. long, 2 mm. thick. 



{To he continued.^ 



