264 



Mycologia 



Atylospora Fayod, Ann. Sci. Nat. VII. 9: 376. 1889 



Psathyra Quel. Champ. Jura Vosg. 118. 1872; not Psathyra 

 Spreng. 1818; not Psathura Commers. 1789. 



This rather difficult genus, well represented both in temperate 

 and tropical regions, is characterized by a cartilaginous stipe, a 

 straight margin appressed when young, and the absence of a veil. 

 It is difficult to distinguish in the herbarium from Psilocybe and 

 Drosophila, Psathyrella differs in having black spores, but even 

 here it is at times hard to draw the line. The species are mostly 

 overlooked or given scant attention by collectors because generally 

 inconspicuous and rather poorly known. In Mycologia for Jan- 

 uary, 1918, I discussed the 21 tropical American species, 11 of 

 which were there described as new. None of our northern forms 

 appear to grow under tropical conditions. 



Stipe 2-4 cm. long. 

 Densely cespitose. 

 Not densely cespitose. 

 Stipe 5—10 cm. long. 

 Densely cespitose. 

 Not densely cespitose. 

 Stipe 1 mm. thick. 

 Stipe 2-3 mm. thick. 



Pileus pale-fawn-colored. 

 Pileus purplish-brown. 

 Stipe 3-5 mm. thick. 



1. A. micro sperma. 



2. A. vestita. 



3. A. multipedata. 



4. A. prunuliformis. 



5. A. australis. 



6. A. umbonata. 



7. A. striatula. 



i. Atylospora microsperma (Peck) comb. nov. 



Psathyra microsperma Peck, Bull. Torrey Club 26 : 68. 1899. 



Pileus ovoid or subhemispheric, becoming deeply convex or sub- 

 campanulate, obtuse, densely cespitose, 1-2.5 cm. broad; surface 

 even, hygrophanous, brown when moist, paler when dry, slightly 

 floccose when young; context brownish; lamellae thin, crowded, 

 adnate-seceding, white to purplish-brown, whitish on the edges; 

 spores smooth, ellipsoid, purplish-brown, about 7x4^; stipe equal, 

 rigid-fragile, hollow, pure-white, fibrillose, 2.5-4 cm. long, 2-3 mm. 

 thick. 



Type locality : Ohio. 

 Habitat : About old stumps. 

 Distribution : Ohio and Michigan. 



