DARK-SPORED AGARICS— I 



DROSOPHILA, HYPHOLOMA, AND PILOSACE 



William A. Murrill 



In Mycologia for January and March, 1918, a series of eight 

 articles on the gill-fungi of tropical North America was concluded 

 with a treatment of species having brown, purplish-brown, or black 

 spores. On page 15 in the January number of that year the four- 

 teen genera of the subtribe Agaricanae were keyed out, beginning 

 with the sessile Melanotus and ending with Coprinus and Clark e- 

 inda, in which the characters are more complex. 



The present series of articles will deal with species occurring in 

 temperate North America, except those confined to the Pacific 

 Coast, which have already been considered for the most part in 

 articles published in Mycologia some years ago. The key to the 

 genera need not be repeated here. I shall, for convenience, begin 

 with the larger, more fleshy species and take up the small, slender- 

 stemmed ones later, reversing the natural order. 



The three genera of the present article may be distinguished 

 from others of the subtribe by a fleshy or fibrous stem, gills that 

 do not deliquesce, and little or no veil, which does not form a 

 definite ring on the stem. They may be separated from each other 

 by the following key : 



Lamellae adnate or adnexed. 



Hymenophore solitary or subcespitose, rarely densely ,cespi- 



tose ; hygrophanous, viscid, or squamulose. Drosophila. 



Hymenophore densely cespitose ; surface firm, dry, glabrous. Hypholoma. 

 Lamellae free. Pilosace. 



Drosophila Quel. Ench. Fung. 115. 1886 



Pileus hygrophanous, glabrous or nearly so, at least at 



maturity ; spores pale, smooth. 

 Pileus dark-colored; spores 5x3 /./<. 1. D. madeodisca. 



Pileus light-colored ; spores larger. 



Spores 9-12 /jj long. 2. D. pecosense. 



Spores 7-9 (i long. 



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