706 



THE AGARICACEAE OF MICHIGAN 



The bitter taste and changing gills and stem distinguish T. 

 acerb it in from T. laterarium Pk. with which it is easily confused. 

 Both species are marked by the narrow, crowded gills, spherical 

 spores, the whitish to pale yellowish-tan cap, and the slight ridges 

 which are found on the margin of the cap. The gills are sometimes 

 spuriously decurrent, when it might be confused with small forms 

 of CUtocybe Candida, but the latter has a mild taste and its pileus 

 becomes concave. Superficially, it approaches T. panoeolum var. 

 caespitosum also. Bresadola (Fungh. mang.) assigns to it obovate 

 spores, measuring 6-7x3-3.5 inicr., while others give them globose. 



744. Tricholoma laterarium Pk. (Edible) 



N. Y. State Mus. Kep. 2G, 1874 (Buffalo Soc. Nat. Hist., 1873). 

 Illustration: Hard, Mushrooms, Fig. 47, p. 66, 1908. 



"PILEUS 5-10 cm. broad, convex-expanded, sometimes slightly 

 depressed in center, pruinose, whitish, disk often tinged with brick- 

 red or brown, the thin margin marked with slight, subdistant, short, 

 radiating ridges. FLESH white. GILLS emarginate, decurrent in 

 slight lines, narrow, crowded, white. STEM 5-7 cm. long, nearly 

 equal, solid, white. SPORES globose, 4-5 micr. diameter." 



Gregarious. On the ground in conifer woods. Probably in the 

 northern part of the State. 



I have no notes on this species, hence have given Peck's descrip- 

 tion. No data are at hand as to its taste and odor. It is close to 

 T. acerbum, apparently only distinguishable by its mild taste and 

 white gills, and may prove to be identical with that species. 



745. Tricholoma leucocephaium Fr. 



Epicrisis, 1836. 



Illustrations: Fries, Icones, PI. 43. 

 Cooke, 111., PL 78. 



PILEUS 3-6 cm. broad, thin, convex then plane, obtuse, even, 

 moist, glabrous, the slight silkiness disappearing, white. FLESH 

 ■compact, white, watery in wet weather. GILLS rounded behind, 

 free, thin, crowded. i>urc white, edge very entire. STEM 5-7 em. 

 long, 4-8 mm. thick, subcartilaginous to fibrous, hollow, solid at the 

 narrowed, rooting base, glabrous, white. SPORES 6-8x3-4 micr. 



