700 THE AGARICACEAE OF MICHIGAN 



**Gills becoming stained or changing to ashy or reddish in age. 



736. Tricholoma laticeps sp. nov. 

 Illustration : Plate CL of this Report. 



PILEUS 3-10 cm. broad, rigid, broadly convex, obtuse, smoky- 

 umber to blackish, moist, even, glabrous, or punctatc-granulose on 

 disk, margin at first strongly decurved. then spreading naked. 

 FLESH firm, brittle, thick, thinner at margin, ciner ascent, scissile. 

 GILLS broadly adnexed, emarginate, close to subdistant, brood, 

 white, at last cinereous, edge sometimes eroded. STEM short, rigid, 

 spongy-solid, 1-3 cm. long, 7-1G mm. thick, equal or subequal, white 

 or pallid, cinerascent within, innately silky. SPOKES short and 

 broadly elliptical to subglobose, smooth, 6-7 x 5-6 micr., white. 

 BASIDIA 30 x 6-7 micr. CYSTIDIA and sterile cells none. ODOR 

 and TASTE mild. 



Gregarious to caespitose. On the bare ground or among mosses 

 or in grassy places, in conifer or frondose woods or groves. Ann 

 Arbor, Detroit, New Richmond. September-November. Infrequent. 



Distinguished by its very short stem and relatively broad pileus 

 which hugs the ground so as to hide the stem. The pileus is often 

 broader in one diameter. It seems to be related to Tricholoma car- 

 tilagincum, but the gills are broad and subdistant in well-developed 

 specimens, and the pellicle is rarely granular-punctate and then 

 only on the disk. The pellicle is rather adnate and composed of 

 long, narrow, horizontal cells. It cannot be referred to T. lugubre 

 Pk. since that species is described as having narrow and close gills; 

 nor to T. turn id tint Fr. whose stem is longer, and whose gills have 

 a rufescent tinge. The scissile flesh indicates a hygropbanous condi- 

 tion, but this is not marked. Its edibility was not tested. 



Section III. Sericella. Pileus without a distinct pellicle, silky 

 or glabrous, very dry; neither moist, viscid, hygropbanous. nor dis- 

 tinctly scaly. Pileus opaque, rather thin. 



