CLASSIFICATION 209 



P.acerinus. — Cap somewhat circular, convex or almost plane, flesh 

 thick at the disc, elsewhere thin, silkily downy, shining white, 1-4 

 in. across ; gills decurrent, very much crowded, thin, white or 

 yellowish ; stem \'ery excentric, almost lateral, slender or almost 

 obsolete, downy. 



On trunks. Tufted or solitary, 



B. — DiMIDIATI 



P. petaloides. — Cap ascending, somewhat obovate or spathulate, 

 almost plane, depressed behind and running into the stem where 

 it is downy, rest glabrous, brownish, becoming pale, edge at first 

 inturned, then expanded, 1-2 in. across ; gills decurrent, very much 

 crowded, whitish, then grey ; stem solid, about J in. long, sometimes 

 very short, compressed, downy, exactly lateral, whitish. 



Cap entire, stem channelled in large specimens, colour of cap 

 variable. Taste bitter. 



On trunks. 



P. serotinus. — Cap thick, convex and gibbous, then plane and 

 ascending, reniform or obovate, even, smooth, with a viscid pellicle 

 in wet weather, yellowish green, sooty olive, etc., edge incurved, 

 then spreading and wavy, 1-3 in. across ; gills not truly decurrent, 

 narrow, crowded, typically yellow, but sometimes tinged pink, 

 or palhd, edge with sooty points ; stem lateral, solid, up to i in. 

 long, or almost absent, thick, deformed, yellowish, with scattered 

 sooty squamules which form a crowded zone near the gills. 



On trunks. Gregarious or imbricately tufted. 



P. pulmonarius. — Cap thin, soft, slightly convex, obovate or 

 reniform, smooth, greyish or tan-colour, about 2 in. long by i in. 

 broad ; gills slightly decurrent, narrow, simple, whitish, then livid ; 

 stem lateral, round, very short, downy. 



Differs from P. serotinus in the very short stem and smooth cap. 



On trunks. Solitary. 



var. juglandis. — Sessile, smaller than the typical form, gregarious. 



On walnut trunks. 



P. mitts. — Cap thin, tough, white, horizontal, reniform, even, 

 smooth, without a viscid pellicle, whitish or with a rufescent tinge, 

 h-i in. across ; gills adnato-decurrent, closely crowded, narrow, 

 simple, white ; stem distinctly lateral, up to | in. long, sometimes 

 very short, compressed and broadened upwards, powdered with 

 white squamules. 



Resembling Panus stypticus in size and habit ; differing in the 

 smooth cap and white colour. 



On fallen branches of conifers, etc. 



P. gadinoides. — Cap rather fleshy, horizontal, semicircular or 

 cockle-shell-shaped, white, hygrophanous, covered with floccose 

 down, no gelatinous stratum present, about | in. across ; gills 

 p 



