24i OUTLINES OF UlllTISII FUXGOLOGY. 



rate, fimbriated, paler than the pileus. — Soiv. t. 345. Huss. i. 

 /.29, 31. 



On trunks of living trees. Very common. Very dark when 

 old. Spores yellow. 



34. P. spumous, Fr.; dirty-white; pileus fleshy, but spongy, 

 compact, pulvinatc or convexo-planc, wrinkled, hispid, flesh 

 white; pores seceding, minute, round, acute, entire. (Plate 

 16, fig. 4^.)— Sow. t.2\l. 



On trunks of various trees. Not common. Very variable 

 in form. Slightly zoned within. 



** Placouermei. — Pileus indurated, cJotTicd loith a more or less 

 decided crust. 



35. P. dryadeus, 2^/\ ; pileus rather soft, spongy, then corky, 

 thick, pulvinate, subferruginous, turning brown ; cuticle thin, 

 soft, pitted, then even and smooth ; flesh fibrous, somewhat 

 zoned, ferruginous as well as the very long, slender, round, 

 soft pores; orifice at first paler. — Bull. t. 458. Huss. i. t. 21. 



At the foot of old oaks. Not uncommon. Often studded 

 with drops of moisture. Spores white. Cuticle not so manifest 

 as in several allied species. 



36. P. betulinus, Fr. ; pileus fleshy, then corky, ungulate, 

 obtuse, smooth, zoneless, covered with a thin, even, brownish, 

 minutely scabrous cuticle; vertex oblique, forming a sort of 

 umbo; pores short, minute, round, unequal, white, at length 

 seceding. — Grev. t. 246. 



On birch-trees. Not uncommon. Makes excellent razor- 

 strops. 



37. P. palloscens, Fr. ; pileus fleshy and spongy, at length 

 corky, thin, zoneless, even, smooth, yellowish; margin acute, 

 of the same colour ; pores short, minute, roundish, white, at 

 length yellowish. — Sow. t. 230. 



