POLYPORUS. 253 



Flesh thin, soft; pileus -i— 2 in. broad, grey or bluish, 

 form variable, sometimes effuso-reflexed, at others triangular, 

 sometimes " stipitate." Pores plane, minute, torn as in 

 Sistotrenia. (Fries.) 



Polyporus spumeus. Fr. 



Whitish, 3-4 in. across, pileus fleshy, spongy, compact, 

 pulvinate, gibbous, rugosely hispid, margin incurved, base 

 stem-like ; flesh zoned towards the margin ; pores minute, 

 rounded, dissepiments acute, entire. 



Polyporus spumeus, Syst. Myc. i. p. 358 ; Cke., Hdbk., 

 p. 273. 



On living or dead trunks. Pores about i mm. across. 



Plant 3-4 in. across, oozing out from the tree in a very 

 soft mass, which hardens in a day, and if it dries favourably 

 the pileus becomes hispid. (Berk.) 



Large, 3 in. across, thick, soft when young, then firmer. 

 Pores of medium size, equal, entire, not deep. On trunks of 

 beech and birch. (Fries.) 



Polyporus lacteus. Fr. 



White. Pileus fibrous, fleshy, fragile, triangular, pubes- 

 cent, zoneless without and within, the inflexed margin 

 acute ; pores medium-sized, becoming labyrinthiform ; dis- 

 sejuments thin, acute, torn. 



Polyporus lacteus, Fries, Syst. Myc. i. p. 359 ; Stev., Brit. 

 Fung., p. 197. 



On dead laburnum, birch, beech, &c. Without a cuticle, 

 small, triangular, soft, taste astringent. Pores plane, 

 flexuous, but very fine and deep, torn into shreds as in 

 Sistrotema. Flesh thinner than the length of the tubes. 



Commonly small, thin, but sometimes larger, transversely 

 elongated, very much sloped downwards and gibbous 

 behind, at length becoming smooth and uneven. 



Inodorous, small, triquetrous, soft, taste astringent. 

 Pores plane, flexuous, becoming torn into Sistotrema-\ikQ 

 teeth. Flesh thinner than length of pores. (Fries.) 



Polyporus pallescens. Fr. 

 Pileus fleshy then corky, thin, even, glabrous, zoneless, 

 yellowish, the acute margin similarly coloui-ed ; tubes short, 

 pores minute, rounded, white then yellowish. 



