196 BRITISH FUNGI 



striate, livid white, whitish when dry, 2-3 in, across ; gills very 

 decurrent, closely crowded, narrow, very unequal, hvid white ; 

 stem hollow, smooth, base rooting, livid, about 3 in. long. 



Somewhat tufted ; becoming altogether whitish when dry, and 

 then somewhat resembling Clitocyhe phyllophila, which may be 

 distinguished by the fibrous stem, piano-depressed cap and very 

 slightly decurrent gills. 



Among damp, rotting heaps of leaves, etc. 



0. detrusa. — Cap rather fleshy, convex, then more or less de- 

 pressed and umbilicate, even, smooth, indistinctly zoned, dark 

 grey, about i\ in. across; gills slightly decurrent, thin, crowded, 

 whitish ; stem smooth, soon hollow, dark grey, about i-i in. 

 long. 



Resembling in habit certain species of Clitocyhe, but dis- 

 tinguished by the cartilaginous stem. 



0. matim (PI. XI, fig. 7). — Cap thin, convex, deeply umbiHcate, 

 smooth, hygrophanous, striate when moist, sooty brown, even, 

 livid, and shining with a silky sheen when dry, i-i| in. across ; 

 gills very deeply decurrent, narrowed at both ends, very closely 

 crowded, shining white ; stem almost horny, fragile, sooty black, 

 1-2 in. long. 



The umbilicus of the cap is ver}- deep, the remainder arched 

 with the edge drooping. Superficially resembling CoUxhia 

 atrata, but distinguished by the decurrent, narrow, crowded 

 gills. 



0. offHciata. — Cap thin, convex, then piano-depressed, but not 

 deeply umbilicate, smooth, even, hygrophanous, dark, then pale 

 flesh-colour, becoming pale or almost white when dry or old, about 

 I in. across ; gills decurrent, crowded, narrow, coloured like the 

 cap ; stem equal, round, then flattened, smooth, reddish, apex 

 slightly mealy, hollow, about 2 in. long. 



The larger forms resemble Collyhia dryophila in habit, the smaller 

 forms resemble Tricholoma carneolum, but quite distinct from both 

 in the decurrent gills. 



In woods, especially beech, among fallen leaves. 



** Plants of medium size ; gills slightly decurrent, narrow, nar- 

 rowed at hath ends. 



0. chrysophylla.—Caip thin, pliant, deeply umbilicate, very 

 hygrophanous, flocculose or squamulose, brownish yellow when 

 moist, tan-colour or whitish, and hoary when dry, i-2| in. across ; 

 gills decurrent, distant, broad, unchangeable deep golden yellow ; 

 stem tough, soon hollow, usually slightly curved, golden egg-yellow, 

 base downy, somewhat rooting, 1-2 in. long. 



Differs from 0. postii in the flocculose yellow-brown cap, broader 

 gills, and in growing on wood. 



On rotten pine wood, pine sawdust, etc. 



