140 FUNGUS-FLOEA. 



thick at the disc, margin very thin ; convex then plane, 

 sometimes depressed, sometimes wavy, even, smooth, tongh, 

 dingy white, a little darker at the disc, shining when dry; 

 gills rounded behind and adnexed or appearing to he almost 

 free when the pileus is depressed, not crowded, dark grey; 

 stem 2-3 in. long, 3 lines thick, attenuated downwards into 

 a rooting base, usually slightly curved, white above and 

 sprinkled with small point-like scales, darker below and 

 often becoming sooty, somewhat longitudinally striate or 

 fibrous, stuffed or rarely hollow ; spores white, globose, 

 4-5 ju, diameter. 



Agaricus {Collyhia) eustygius, Cke., Grev., xix. p. 41 ; Cke., 

 Illustr., pi. 1185. 



On the ground. 



A well-marked species, characterised by the dark grey 

 gills and strong rancid smell. Distinguished from the grey- 

 gilled species of Clitocybe and Tricholoma by the character of 

 the gills. The whole plant turns black when dry. 



** Gills narrow, crowded, 



CoUybia acervata. Tr. 



Pileus 2-3 in. across, flesh thin, convex then expanded, 

 obtuse or at length gibbous, pale flesh-colour when moist, 

 whitish when dry, margin at first incurved, then expanded 

 and slightly striate ; gills adnexed at first, soon free, very 

 closely crowded, narrow, plane, tinged flesh-colour then 

 whitish; stem 2-4 in. long, 1-2 lines thick, rigid, fragile, 

 distinctly fistulose, slightly attenuated upwards, rarely 

 compressed, very glabrous except at the base, even, rufous 

 or sometimes brown, wall of the cavity of the stem glabrous ; 

 spores elliptical, 7-8 X 3 • 6 /*. 



Agaricus {Collyhia) acervatus, Tries, Epicr., p. 92; Cke., 

 Hdbk., p. 70 ; Cke., Illustr., pi. 267. 



In woods at base of pine trunks, &c. 



Caespitose, stems numerous, crowded, joined together and 

 covered with white down at the base. Allied to G. confluens, 

 but distinguished by the very glabrous stem. 



CoUybia dryophila. Bull. 

 Pileus 1-2 in. across, flesh thin, white; convex then 



