124 Journal of the Mitchell Society [September 



19. Clitocybe dealbata Sow. 



C. sudorifica Pk., toxic form. 

 C. morhifera Pk., toxic form. 



Plates 31 and 33 



Small plants growing gregariously in grass in lawns and pastures, 

 not rarely cespitose in twos. Cap up to 4.5 cm, in diameter, usually 

 smaller, smooth or sometimes slightly pruinose, especially near the 

 margin, dull or shiny, wavy and often irregular, depressed in center 

 (umbilicate) ; color a light buff or fleshy buff, sometimes with brown 

 areas; the thin margin incurved and whitish, and slightly extended 

 beyond the gills. Flesh very thin towards the margin, thick towards 

 the center, about 2.5 mm. thick half way between ; pale flesh color, 

 with a distinct taste of meal, not at all bitter. The taste is just like 

 that of Tricholoma panaeolum except that it is not bitter. As the 

 plants get old they often become water-soaked and therefore much 

 darker brown. 



Gills moderately close, deepest in middle where they are 3,5-5 mm. 

 deep, not branching, slightly notched at the stem, not decurrent, 

 fleshy white, then fleshy tan. 



Stem color of cap, 1.5-2,5 cm, long, about 3 mm, thick in center, 

 tough and elastic, solid or hollow, smooth, pruinose at top and bot- 

 tom, slightly tapering towards the base, white at base, and the white 

 mycelium often obvious. 



Spores (of No, 929) white, very small, smooth, elliptic, 

 2-2.5 X 3.8-5.2/x, 



The color of our plants is not pure white as is described for the 

 species. From the farinaceous taste and odor this would be var. 

 minor Cooke, but that is said to grow in leaves. It is almost exactly 

 like the form that grows in mushroom beds and described as var. 

 deformata by Peck, 



Two toxic forms have been described by Peck, C dealbata sudorifica 

 (N, Y, St, Mus, Bull. 150: 43. 1911. Later described as a species in 

 Bull. 157: 67, pi. 7, figs. 1-6. 1912) and C, morbifera (Bull. Torr. 

 Bot. Club 25: 321. 1898), These do not seem to be distinguishable 

 morphologically in Murrill's opinion (Mycologia 7: 260, 1915), al- 

 though Kauffman treats them as distinct. We have examined the types 

 of both and find thorn alike and like our ])lants, and the spores are 

 the same in all three cases (C sudorifica, 2,2-3x4-5.2/1; C. morbifera, 



