84 NEW YORK STATE MUSEUM 



sembles externally but from which it is separated by its more 

 narrow obtuse and smooth spores and by its broader flask-shaped 

 cystidia. Its glabrous rugosely and radiately wrinkled pileus 

 separate it from H. velutinum ,(Pers.) Fr. The pileus 

 also having neither spots nor regular striations distinguishes it 

 from H. le p i d o t u m Bres. Specimens of it have been re- 

 ceived from Eglon, West Virginia, and from Rockville, Indiana. 



Pileus carnosus, tenuis, convexus vel subplanus, in centro ali- 

 quando leviter depressus, glaber, rugosus vel radiate rugosus, in 

 siccitate margine striis irregularibus radiantibus ornatus, aliquando 

 margine irregularis, brunneus fulvo-brunneus vel rufo-brunneus, 

 frequenter in centro nigrescens, carne albida ; lamellae tenues, con- 

 fertae, adnatae, aliquando leviter sinuatae, brunneae deinde nigro- 

 brunneae; stipes aequalis,- glaber, cavus, pallidus vel pileo in colore 

 similis; sporae laeves, ellipsoideae, 8-10x4-6/^-; cystidia 40-60 

 X 16-20 !J, 



Several species formerly referred to this genus have been omit- 

 ted because of erroneous determination or because they are more 

 closely related to the genus Psilocybe. 



NEW YORK SPECIES OF PSATHYRA 



Psathyra Fr. 



Pileus membranaceous, conic or campanulate, fragile, hygro- 

 phanous, the margin at first straight and appressed to the stem ; 

 mature lamellae brown or purplish brown ; stem subcartilaginous, 

 fragile, polished, hollow ; veil none or only universal and floccose 

 fibrillose. 



The genus may be separated from Psilocybe by the fragile 

 character of the pileus and stem and by the straight appressed 

 margin of the young pileus. It is divided into three sections, 

 Conopileae, Obtusatae and Fibrillosae. Of the first section no 

 representative has yet been found within our limits. 



Obtusatae 



Pileus campanulate or convex, glabrous or atomate ; lamellae 

 plane or arcuate ; veil none. 



KEY TO THE SPECIES 



Pileus growing on decaying wood conica 



Pileus growing on ground among hair cap mosses. polytrichophila 



