-,!_. THE AGARICACEAE OF MICHIGAN 



Solitary or scattered. On rotten logs, etc., in conifer and fron- 



dose woods. 



Throughout the State: Houghton, Huron Mountains, Marquette, 

 Bay View, Ann Arbor. July-September. More frequent in mixed 

 hemlock woods; never common. 



The villosity and granulosity on the cap, when present, is due 

 to globular or elongated-fusoid cells, tilled with coloring matter. 

 These cells correspond to the fibrils of such species as P. umbrosus, 

 from which this species is separated by the spherical spores and 

 cystidia without prongs at the apex. Peck describes the spores in 

 the 26th report as spherical, later, in the 38th report, he says 

 ''broadly elliptical, 6-7.5 x 5-6 inicr." Our plants, like Lloyd's 

 (Mycol. Notes, 2), have spherical spores. 



Yar. umbrosellus Atk. nov. var. is distinguished by the more 

 villose pileus and the tinge of yellow on the edge of the gills. 

 The Villosity is caused by long, yellowish brown cells, 200- 

 300 micr. long, 20-30 inicr. wide, often crowded into erect, pointed 

 scales, arranged in sooty, radiating or reticulate, velvety ridges. 

 The edges of the gills are provided with sterile cells filled with a 

 pale yellow coloring matter. The cystidia are scattered, globose or 

 pyriform, not pronged. The spores are 4-5 x 3-4 micr., longer than 

 broad, subglobose, similar to those of P. umbrosus; the cystidia, 

 however, separate it from the latter. 



Var. intermedins nov. var. approaches Leptonia seticeps in size 

 of spores, and white-fimbriate edge of gills; but the stem is stuffed, 

 then hollow, and 4-5 cm. long, 4-5 mm. thick. The cap is ruglose- 

 villose and 2-5 cm. broad. 



Solitary or scattered. On rotten wood. Detroit, etc. Infre- 

 quent. 



581. Pluteus nanus Fr. 

 Syst Mycol., 1821. 



Illustrations: Patouillard, Tab. Analyt, No. 334. 

 Ricken, Blittterpilze, PI. 70, Fig. 6. 



PILEUS 2-3 cm. broad, convex then expanded, obtuse, radiately 

 niffo.se on disk, margin even or nearly so, velvet y-prwinose, gran- 

 nh.se or pulverulent, brownish ashy, umber or darker when young. 

 GILLS Free, close, ventricose, narrowed toward ends, white then 

 flesh color from spores, edge fimbriate. STEM 2-3 cm. long. 2-3 

 "nn. thick, solid, equal, rigid often curved, glabrous, pellucid-white, 



