Murrill: Agaricaceae of Tropical North America 19 



Surface not striate; stipe 1.5 cm. 

 long. 



Surface distinctly striate ; stipe 

 3 cm., long. 



16. A. mammillata. 



ijr A. cinchonensis. 



Pileus 2-3 cm. broad. 



Pileus pallid with purplish tints. 

 Pileus avellaneous-isabelline. 

 Pileus fulvous. 

 Pileus fuliginous. 



18. A. Roystoniae. 



19. A. plana. 



20. A. pseudotenera. 



21. A. fuliginosa. 



I. Atylospora tigrina (Pat.) 



Psathyra tigrina Pat. Bull. Soc. Myc. Fr. 15: 197. 1899. 



Known only from specimens collected by Duss on rotten stumps 

 at Basse-Terre, Guadeloupe. It has many characters in common 

 with Coprinus, but the spores are purplish-brown. 



Pileus hemispheric to broadly convex, with a small umbo, not 

 expanding, scattered, 6 mm. broad and 2 mm. thick ; surface 

 striate, uniformly avellaneous, glabrous; margin straight, entire, 

 concolorous ; lamellae adnate, ventricose, distant, umbrinous to 

 fuliginous, paler and entire on the edges ; spores broadly lemon- 

 shaped, smooth, subopaque, uniguttulate, purplish-brown under 

 the microscope, about 5X4^; stipe curved, equal, slightly rough- 

 ened, umbrinous, 5 mm. long, 0.5 mm. thick. 



Type collected on a dead fallen stick at Cinchona, Jamaica, 

 1,500 m. elevation, December 25-January 8, 1908-9, IV. A. & 

 Edna L. Murrill 463 (herb. N. Y. Bot. Gard.). 



Agaricus commiscibilis Berk, in Warming, Vidensk. Meddel. 



1879-80: 33. 1879. 

 Psathyra commiscibilis (Berk.) Sacc. Syll. Fung. 5: 1068. 1887. 



Described from specimens collected at Rio de Janeiro. Brazil, 

 by Glaziou, and also found in St. Thomas. The species greatly 

 resembles Psathyrella minutula in general appearance, but is dis- 

 tinguished by its spores, which are ovoid to ellipsoid, smooth, 

 purplish-brown under the microscope, 7-8 X 4~5 



2. Atylospora diminutiva sp. no v. 



3. Atylospora commiscibilis (Berk.) 



