Murrill: Agaricaceae of Tropical North America 25 



20. Atylospora pseudotenera (Fries) 



Agaricus pseudotener Fries, Nova Acta Soc. Sci. Upsal. III. i : 26. 



Psathyra pseudotenera (Fries) Sacc. Syll. Fung. 5:1065. 1887. 



Known only from specimens collected by Oersted at Naranjo, 

 Costa Rica. The species resembles Galerula tcnera. There is a 

 good colored figure at Copenhagen, but no specimens have been 

 found. 



Pileus hemispheric, not expanding, not umbonate, gregarious, 2 

 cm. broad and 1 cm. high ; surface smooth, glabrous, hygro- 

 phanous, slightly striate, uniformly fuliginous, becoming some- 

 what paler on the disk ; margin straight, eroded, co'ncolorous ; 

 lamellae adnate, broad, ventricose, subcrowded, fuliginous, entire 

 on the edges ; spores usually ovoid, tapering at one end, smooth, 

 purplish-brown, 7 X 4-5 p ', stipe equal or somewhat larger below, 

 slender, smooth, glabrous, concolorous, whitish toward the base, 

 4-5 cm. long, 1.5-2 mm. thick. 



Type collected in damp soil at Morce's Gap, near Cinchona, 

 Jamaica, 1,500 m. elevation, December 29, 30, January 2, 1908-9, 

 W. A. & Edna L. Murrill 748 (herb. N. Y. Bot. Gard.). Also 

 collected at the same time and place, W. A. & Edna L. Murrill 



4. Psathyrella (Fries) Quel. Champ. Jura Vosg. 122. 1872 



Agaricus § Psathyrella Fries, Epicr. Myc. 237. 1838. 



Characterized by black spores and a straight, appressed margin 

 when young. It is best known, perhaps, through its interesting 

 little representative, Psathyrella minutula, which is widely distrib- 

 uted. A number of temperate species belong to this genus. 



Pileus small, 2 cm. or less broad. 

 Pileus white or gray. 



Spores tapering at the ends. 1. P. minutula. 



1851. 



21. Atylospora fuliginosa sp. nov. 



680. 



Spores rounded at the ends. 



2. P. grisea. 



Pileus avellaneous. 



Pileus conic ; solitary. 

 Pileus convex ; cespitose. 



3. P. mexicana. 



4. P. Earlei. 



5. P. cubensis. 



6. P. Stevensonii. 



Pileus reddish-brown to pale-rosy-isabelline. 



Pileus large, 4-7 cm. broad. 



