126 FUNGUS-FLOE A. 



panded, moist, very smooth and even, dark obscure green 

 when moist, pale grey or whitish when dry ; gills nari'ow, 

 crowded, thin, margin rather undulate, dingy, slightly 

 adnexed, separated from the flesh of the pileu.s by a dark 

 c irtilaginous line, a continuation of the outer portion of 

 the stem; spores subpiriform, 6 x 3/t; stem cartilaginous, 

 spongy, stuffed, becoming imperfectly hollow, tapering 

 upwards, minutely striate, 1^2 in. long, |- in. thick at base, 

 pale clear brown, darkest below. 



Agaricus (Collybia) bibulosus, Massee. 



On stumps. In groups of 24, pileus very bibulous, 

 changing from blackish green to pale grey during drying. 

 Often rooting into the wood. Allied in many points to 

 Collybia butyracea. 



Collybia xylophila. Fr. 



Pileus 2-3 in. across, flesh thin, fragile ; campanulate, lax 

 then expanded, broadly gibbous, glabrous, disc brownish- 

 tan becoming whitish towards the margin; gills adnate, 

 closely crowded, very narrow, white ; stem about 2 in. long, 

 2-3 lines thick, equal, not quite straight, fibrillosely striate, 

 whitish ; spores elliptical, 4 x 2'5 /A. 



Agaricus (Collybia') xylophilus, Fries, Monogr., ii. p. 289; 

 Cke., Illustr., pi. 202 ?; Cke., Hdbk., p. 65. 



On rotten trunks, elm, &c. 



Cooke's figure differs very materially from that of Fries, 

 Icon., t. 63, f. 2. 



A very fine species, usually densely caespitose. Stem 

 hollow, 2-3 in. long, 3 lines thick, equal but often flexuose, 

 fibrillosely striate, whitish, brownish inside. Pileus ample, 

 campanulate, broad, up to 3 in. across (up to 4 in. when ex- 

 panded), usually obtuse, sometimes with a small but true 

 umbo, and when much expanded broadly gibbous, glabrous, 

 whitish or the centre brownish-tan. When much ex- 

 panded the margin is cracked and split. Flesh everywhere 

 very thin, fragile, watery-brown. Gills adnate, often with 

 a small decurrent tooth, very narrow, a line broad at most, 

 very much crowded, edge entire. (Fries.) 



C. confluens and G. ingrata differ in having the stem downy 

 or pulverulent. 



