212 BRITISH FUNGI 



P. algidus. — Cap rather fleshy, at first resupinate, then expanded 

 and horizontal, reniform, covered with a thin viscid cuticle, smooth, 

 reddish brown, about i in. across ; gills radiating from the point of 

 attachment of the cap, rather broad, crowded, yellowish. 



Cap grey, umber or reddish brown, often pruinose \\hen young. 



On trunks. Often tufted or imbricated. 



P. fiuxilis. — Cap rather fleshy, sessile, reniform, ^•ery slightly 

 depressed behind, even, pale umber, gelatinously viscid, up to | in. 

 across ; gills di\-erging from the point of attachment of the cap, 

 distant, few, simple, white. 



On mosses, growing on trunks' also on sawdust. 



P. cyphellcBformis. — Cap rather fleshy, sessile, cup-shaped, more 

 or less pendulous, upper layer gelatinous, grey, edge paler, sprinkled 

 with a few mealy scales, very minutely downy, especially at the 

 base, up to \ in. across ; gills narrow, distant, pure white. 



Gregarious, resembling a Cyphella in habit. 



On dead stems of herbaceous plants. 



P. applicatiis. — Cap cup-shaped and orbicular when young, 

 usually sessile and fixed by the downy base, rarely with a very short, 

 rudimentary stem, greyish brown, up to \ in. across ; gills radiating 

 from a central point, scanty, rather thick, distant, paler than the 

 cap, edge whitish. 



Cap reflexed when adult, but never truly dimidiate, colour vari- 

 able, blackish blue, dark or ashy grey. 



Known amongst the minute species by its dingy colour. 



Somewhat resembling P. tremulus, but known by the absence of 

 a distinct stem. 



On rotten wood. 



*** Cap membranaceous , not viscid. 



P. hohsoni. — Thin and delicate, reniform or semicircular, hori- 

 zontal, plane, grey, minutely downy, 2-4 lines across ; gills rather 

 distant, radiating from the point of attachment of the cap, pallid. 



Differs from P. applicatiis in being horizontal and plane, not cup- 

 shaped, and much paler in colour. 



On stumps, branches, etc. 



P. striaiulus. — Cap very thin, pale brownish grey, more or less 

 concave, flaccid, smooth, striate, sessile, 2-3 lines across ; gills 

 broad, few, distant, greyish, radiating from an excentric point. 



Known among the minute grey forms by the smooth, striate cap. 

 Variable in form, obconically campanulate and pendulous when 

 growing on the under side of trunks ; imbricated and reflexed, or 

 irregular. Contracted and difficult to see when dry. 



On fallen branches, wood, etc. 



P. Iiypnophilus. — Cap very thin, resupinate, flat, white, somewhat 

 reniform, nearly smooth, 2-4 lines across ; gills radiating from the 

 point of attachment of the cap, narrow, distant. 



