POLYPORUS. 195 



23. P. acanthoides Fr. In many imbricated layers, pliant Poiyporus. 

 then coriaceous. Pileoli ferruginous, infundibuliform, inciso- 

 dimidiate, somewhat zoned, longitudinally rugose. Stems con- 

 nato-branched, white then rufescent. Pores lamelloso-sinuate, 

 thin, toothed at the edge, white then rufescent. 



Thinner than P. giganteus, pale when young. Although it is somewhat 

 coriaceous, it very soon hardens, and becomes fragile when old. P. rufescens 

 differs sufficiently in the spongy, hairy pileus, in not being undulato-lobed, &c. 



On trunks. Penzance. 



Name a/cav^o;, e!So?. From the resemblance of the pileoli to Acanthus 

 leaves. Fr. Hym. Eur. p. 540. B. & Br. n. 1694. Bull. t. 486. Pers. Ic. 

 Pict. t. 6. 



C. Caseosi. Pileus cheesy, &c. 



24. P. sulphureus Fr. In many caespitose layers, 1-2 ft. and 

 more, juicy-cheesy. Pile! 20 cent. (8 in.) or more broad, reddish- 

 yellow, imbricated, undulated, rather smooth ; flesh light yellow- 

 ish, then white, splitting open and not hardened when old. Pores 

 minute, plane, sulphur-yellow. 



Soon becoming pale. Commonly sessile, but varying with a stem (Batt. t. 

 34. B. Paul. t. 14), lateral on standing trees, but expanded on all sides on 

 fallen ones; also club-shaped, porous throughout, Sow. In its fullest vigour 

 it is filled with sulphur-yellow milk. 



On living trees and stumps. Frequent. Aug.-Oct. 



Whole mass sometimes 2-254 ft. broad. A lovely plant, of delicate shades. 

 Spores oval, white, minutely papillose, 8 x 5 mk. W.G.S. Edible. Name 

 sulphur, brimstone. Sulphur-yellow. Fr. Hym. Eur. p. 542. Syst. Myc. i. 

 p. 357. Sv. iitl. Sv. t. 88. Berk. Out. p. 241. /. 16. / 3. C. Hbk. n. 752. 

 5. Mycol. Scot. n. 707. Grev. t. 113. Ventur. t. 53. f. 6-7. Rostk. t. 20. 

 Husscy i. t. 46. Bull. t. 429. Sow. t. 135. Schceff. t. 131, 132. Fl. Dan. 

 t. 1019. 



25. P. Herbergii Rostk. Caespitose, rather corky. Pileoli 

 imbricated, bright bay, sulphury about the margin. Pores 

 labyrinthiform, unequal, torn and toothed, pale cinereous. 



On trunks. Edinburgh Fungus Show, 1878. Oct. 



Referred with doubt to P. spongia by Fries. Berkeley considers it clearly 

 the plant of Rostkovius. Name after Herbergius. Rostk. xxix. /. 18. B. 

 & Br. n. 1805. Grevillea, viii. p. 6. P. spongia Fr. Hym. Eur. p. 542. 

 S. Mycol. Scot. n. 708. 



26. P. alligatus Fr. In many casspitose layers, fibrous-fleshy, 

 rigid-fragile. Pile! tan-isabelline, imbricated, unequal, zoneless, 

 villous. Pores minute, soft, white, readily becoming stopped 

 up with flocci. 



