CLASSIFICATION 381 



Variable in shape, truly dry in texture, elastic, becoming hard 

 and woody, globose, shell-shaped, triangular or substipitate, but 

 not^effuso-reflexed. 



On decaying pine wood. 



P. velutinus. — Pileus horizontal, thin, corky, then rigid, velvety, 

 white, then yellowish, indistinctly^zoned ; pores shallow, irregularly 

 angular, white. 



Sometimes imbricated, 1-3 in. across ; differs from P. versicolor 

 in whitish colour, and from P. hirsntus in soft, velvety pileus. 

 When young often clear yellow. 



On trunks and stumps. 



P. gossypmus. — White. Pileus 1-4 in. across, adnato-reflexed. 

 flat, thin, downy, zoneless ; pores rather deep, wavy, then angular, 

 greyish. 



Distinguished by the irregular, torn, greyish pores. 



On trunks, furze stems, etc. 



P. abietinus.— Pileus thin, limp, partly adnate and partly loose 

 and reflexed, silky, greyish white, indistinctly zoned ; pores violet, 

 unequal, torn, becoming pale. 



Often crowded and imbricated for several feet. 



On trunks of decaying fir trees. 



P. wynnei. — Pileus leathery, partly effused and partly loose and 

 reflexed, or encrusting various substances, tan-coloured, with raised 

 zones ; pores shallow, minute, angular, white. 



Running over twigs, moss, etc. 



PORIA 



Entirely resupinate, forming extended patches, thin ; pores 

 usually covering the entire surface, minute, more or less circular, 

 often becoming torn and irregular. 



Distinguished from resupinate forms of allied genera by the 

 small, regular pores. 



I. Pores persistently whitish. 



P. vaporaria (PI. XXXI, fig. 3). — Broadly effused, thin, in- 

 separable ; pores rather large, angular, often liecoming torn, white, 

 then yellowish. 



Probably the commonest and most universally distributed of 

 fungi, present practically on every fallen, rotten branch in woods, 

 which it often almost completely covers. Pores becoming unequal 

 and torn, pale tan when old. More frequent on bark than on 

 naked wood. 



P. mollnsca. — Effused and forming patches 1-6 in. across, soft, 

 white, edge fibrillose and radiating ; pores very short, minute, 

 roundish, occupying the central portion, or in scattered clusters. 



