26 



Mycologia 



i. Psathyrella minutula (Schaeff.) 



Agaricus minutuhts Schaeff. Fung. Bavar. 4:Ind. 72. 1774. 

 Agaricus disseminatus Pers. Syn. Fung-. 403. 1801. 

 Psathyrella disseminata Quel. Champ. Jura Vosg. 123. 1872. 



This very attractive little species was first described from Ba- 

 varia and accurately figured in color by Schaeffer. The synonymy 

 is considerably complicated but it seems quite certain that the spe- 

 cific name under which the plant is best known has been in use 

 since 1801, when Persoon extended his former use of this name to 

 include the juvenile form as figured by Schaeffer in his plate 308. 



The species appears to be cosmopolitan, or at least very widely 

 distributed on decayed wo'od and moist earth containing organic 

 matter, the caps often occurring in such large numbers in one spot 

 that it would seem impossible to count them. Psathyrella prona 

 is a European species somewhat similar in appearance but with 

 much larger spores. 



Xuchiles, near Cordoba, Mexico, W. A. & Edna L. Murrill 

 1 159 ; Sumidero, Cuba, Shafer 13913. 



2. Psathyrella grisea sp. nov. 



Pileus very thin, small, conic to campanulate, not expanding, 

 gregarious to subcespitose, 5-10 mm. broad and high; surface 

 griseous, minutely whitish-floccose to subglabrous, distinctly 

 striate to the disk ; margin thin, concolorous, becoming irregular 

 or splitting with age, incurved on drying ; lamellae adnate, rather 

 distant, very thin and fragile, becoming blackish with age ; spores 

 ellipsoid, rounded at both ends, smooth, dark-purplish-brown 

 under the microscope, 7-8.5X3-5-4-5/^; stipe filiform, slightly 

 increasing toward the base, smooth, white, glabrous, 2-3 cm. long, 

 1 mm. or less thick. 



Type collected on fallen dead sticks at Motzorongo, near Cor- 

 doba, Mexico, January 15, 1910, W. A. & Edna L. Murrill 1077 

 (herb. N. Y. Bot. Gard.). A dainty little plant, reminding one 

 of Psathyrella minutula and certain species of Coprinus. My 

 field notes state that the pileus soon deliquesces. 



3. Psathyrella mexicana sp. nov. 



Pileus conic, not expanding, solitary, 1 cm. broad and high ; 

 surface hygrophanotis, glabrous, rugose-striate, avellaneous, pale- 



