Murrill : Agaricaceae of Tropical North America 63 



Hymenophores gregarious, rarely cespitose. 



Pileus grayish-brown, argillaceous when dry.. 3. D. campestris. 

 Pileus dark-brown or reddish-brown, paler 



when dry 



Spores very pale, 11-13 fi long 4. D . pallidispora. 



Spores darker and shorter 5. D. flocculosa. 



Species occurring among humus in woods. 

 Hymenophores solitary. 



Pileus umbonate 6. D. tepeitensis. 



Pileus not umbonate 7. D. jalapensis. 



Hymenophores subcespitose 8. D. tenuis. 



Species occurring on dead wood either buried or exposed. 

 Hymenophores solitary or gregarious. 



Spores truncate 9. D. truncatispora. 



Spores not truncate 10. D. atricastanea. 



Hymenophores densely cespitose. 



Stipe 5-7 cm. long; margin of pileus not striate. 11. D . appendiculata. 

 Stipe 6—12 cm. long; margin of pileus faintly 

 striate 12. D. caespitosa. 



i. Drosophila castaneidisca sp. nov. 



Pileus thin, convex, solitary, 2.5 cm. broad ; surface hygrophan- 

 ous, avellaneous, slightly tinged with chestnut, pale-chestnut on 

 the disk; margin straight, entire, concolorous, striate; lamellae 

 adnate, narrow, crowded, chestnut ; spores ellipsoid or ovoid, 

 smooth, pale-bay under the microscope, 7X3-5-4-5/*; stipe 

 cylindric, equal, smooth, white, furfuraceous, 3 cm. long, 2 mm. 

 thick. 



Type collected in soil on a rubbish heap in Castleton Gardens, 

 Jamaica, 180 m. elevation, December 14, 15, 1908, IV. A. & Edna 

 L. Murrill ny. Known only from the type locality. 



2. Drosophila brevipes sp. nov. 



Pileus broad, thin, fleshy, irregularly convex, obtuse, not fully 

 expanding, solitary, 4-5 cm. broad; surface dry, corrugate and 

 plicate, pale-tan, darker on the disk, delicately floccose from the 

 remains of the veil, substriate on the margin, which becomes up- 

 turned on drying; context without odor ; lamellae adnate, crowded, 

 rather narrow, uneven and many times inserted, pallid to brown ; 

 spores ellipsoid, smooth, opaque, distinctly purplish-brown under 

 the microscope, uniguttulate, about 9 X 4-5 p ', cystidia few, deli- 

 cate, hyaline, subcylindric, about 50 X 12/x; stipe tapering down- 

 ward, whitish, minutely whitish-flocculose above, fibrillose- 



