POLYPORUS. 197 



30. P. alutaceus Fr. Pileus 2.5 cent, (i in.) broad and thick, 

 tan, fleshy, at length tough, reniform-dilated, somewhat velvety, 

 obsoletely zoned within, margin acute, even. Pores very small, 

 thin, somewhat round, whitish-tan-colour. 



Somewhat imbricated, sometimes convex, sometimes flattened, occasionally 

 hairy and rugose, plane beneath. 



On decayed pine-stumps. Glamis, 1876. Sept.-Oct. 



Tubes about 18 mm. (% in.) long. Name aluta, tanned leather. Tan- 

 colour. Fr. Hym. Eur. p. 545. Syst. Myc. i. p. 360. B. 6^ Br. n. 1799. S. 

 My col. Scot. n. 711. Rostk. t. 30. 



31. P. pallescens Fr. Pileus 5 cent. (2 in.) broad, yellowish, 

 the acute margin of the same colour, fleshy then corky, even, 

 smooth, zoneless. Pores curt, minute, round, white, then 

 yellowish. 



Somewhat caespitose, commonly small and thin, of doubtful affinity. 

 On old stumps. Rare. 



Name /tf//^0, to grow pale. Fr. Hym. Eur. p. 546. Syst. Myc. \. p. 

 369. Berk. Out. p. 244. C. Hbk. n. 773. Sow. t. 230. 



32. P. chioneus Fr. White. Pileus 2.5 cent, (i in.) and more 

 broad, fleshy, soft, becoming even, smooth, zoneless, often extended 

 behind, margin inflexed. Pores curt, very small, round, equal, 

 quite entire. 



Always soft, fragile, hyaline-white when moist, shining white when dry. 

 Odour acid. Without a cuticle. 



On stumps, &c. Uncommon. July-Sept. 



Spores white, oval, 21x3 mk. W.G.S. Name \<MV, snow. Snow-white. 

 Fr. Hym. Eur. p. 546. Berk. Out. p. 241. C. Hbk. n. 757. S. My col. Scot. 

 n. jiz.Pers. Myc. Eur. 2. t. 15. /. 2. 



33. P. cerebrinus B. & Br. About 2.5 cent, (i in.) across, 

 snow-white, pulvinate, delicately tomentose, becoming smooth, 

 margin crenate. Pores rounded, entire, dissepiments thick, 

 obtuse. 



Looks like a portion of white brain. 

 On fir. Glamis, 1877. Aug. 



Name cerebrum, brain. Brain-like. B. 6^ Br. n. 1800. S. Mycol. Scot. 

 n. 713. 



** Pores elongated, flexuous, fy*c. 



34. P. lacteus Fr. Shining white. Pileus fleshy- fibrous, 



