POLYPOBUS. 241 



situation and position. Substance light, spongy ; when old, 

 dry and friable, never coriaceous. In the young state 

 whitish, soft, and presenting nothing but a plane, convex, 

 and somewhat effused surface. (Grev.) 



Polyporus Herbergii. B. & Br. 



Caespitose, 4-8 in. across, rather soft and corky ; pilei 

 imbricated, bright rusty - bay, becoming sulphur - yellow 

 towards the margin ; tubes 24 lines long, pores labyrinthi- 

 form, unequal, pale grey, dissepiments torn. 



Polyporus Herbergii, Berk, and Broome, Ann. Nat. Hist., n. 

 1805; Stev., Brit. Fung., p. 195. 



Polyporus spongia, Fr., Hym. Eur., p. 542. 



Boletus Herbergii, Rostkovius, in Sturm's Deutschl. Cr. 

 FL, pt. 29, t. 18. 



On trunks. 



Minutely velvety, becoming almost glabrous, soft and 

 felt-like to the touch, bright rusty-brown, often bright 

 yellow at the margin. Considered by Cooke as a variety of 

 Polyporus cuticularis. 



Polyporus alligatus. Fr. 



Usually in many tufted or overlapping layers, pilei vari- 

 able in size and form, 1-3 in. across, rather fleshy, flesh 

 rather fibrous, rigid, fragile ; pilei pale dingy tan-colour, 

 not zoned, imbricated, unequal, minutely velvety or villous ; 

 pores short, small, soft, white, often sterile, and filled with 

 delicate hyphae ; spores elliptical, pale, 6 X 7 /A. 



Polyporus alligatus, Fries, Elench., p. 78; Stev., Brit. 

 Fung., p. 195. 



On roots, &c., often involving grass, twigs, &c., during its 

 growth ; pores about ^ mm. across. 



Exceedingly variable in form, irregularly club-shaped or 

 variously expanded, but without a distinct stem. Lobes 

 often imbricated, unequal, dilated, often circular in outline, 

 undulated, silky-villose, dirty pale tan-colour, flesh rigid, 

 fibrous, paler. 



Polyporus heteroclitus. Fr. 



Tufted, coriaceous, pilei springing from every side of a 

 hard tubercular base, lobed, villous, thin, zoneless, yellowish, 

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