CLASSIFICATION 339 



P. fibnllosa.—Ca.p up to i| in. across, campanulato-convex, then 

 expanded, minutely striate, livid, then whitish, at first fibrillose ; 

 gills blackish purple ; stem about 2 in. long, white, fibrillosely 

 squamulose. 



In woods on the ground or on fallen rotten branches. 



P. goydoni. — Densely tufted. Cap up to i| in. across, campanu- 

 late, grey, then whitish, edge grooved, sprinkled with white floccose 

 scales ; gills grey ; stem about 2 in. high, white, transversely un- 

 dulate, mealy above, floccose below. 



Smell strong, unpleasant. When }'oung the whole plant is 

 covered with white floccose fibrils. 



P. helohius. — Cap about i-l in. across, conico-campanulate, be- 

 coming almost flat and with concentric, elevated ridges, radially 

 wrinkled, subumbonate, sooty brown, then pale with a reddish 

 tinge ; gills sooty brown ; stem reddish umber, with fugacious 

 squamules, paler when dry. 



Damp ground in woods. 



P. pcnnata. — Cap about i in. across, campanulate, ochraceous, 

 disc brownish, at first covered with \\'hite, feathery squamules ; 

 gills blackish brown ; stem about 2 in. long, silvery white. 



On naked soil. 



P. gossypina. — Cap up to i in. across, campanulate, then ex- 

 panded, dingy pale ochraceous, downy, then smooth, edge striate ; 

 gills white, then brownish black ; stem about 2 in. long, whitish, 

 downy, sometimes rather wavy. 



Often somewhat tufted. Distinguished from Psathyra pennata by 

 striate edge of cap. 



In woods on the ground, fragments of wood, etc. 



P. noli-tangere. — Cap up to | in. across, bell-shaped, then ex- 

 panded, everywhere striate, pale umber, paler when dry, squamu- 

 lose about the edge ; gills broad, pale brown ; stem about i\ in. 

 long, pale umber. 



Every part pale umber when moist, cap becoming paler when dry. 

 Very fragile. 



Among chips, etc. 



P. microrliiza. — Cap about i in. across, bell-shaped, shining with 

 sparkling atoms, at first with yellow hair-like fibrils ; gihs pale, 

 then blackish brown ; stem about 2 in. long, whitish, silky, nar- 

 rowed into a rooting base. 



Gregarious, everywhere flocculose at first, fragile. Sometimes 

 very small. Known best by the tapering rooting stem. 



Among grass. 



P. tirticcBcola. — Cap 2-3 lines across, bell-shaped, whitish, floccu- 

 lent ; gills white, then chocolate ; stem |-i in. long, flocculent, white. 



Known by its small size and white colour. 



On dead nettle stems. 



