160 FUNGI. [Irpex^ 



On fallen branches of beech. Appin, Captain Carmichael. — In 

 young perfect specimens the membrane is furnished with branched ribs, 

 which, according to Fries, adhere less firmly to the matrix ; margin most 

 elegantly radiato-fibrillose, white. Dry specimens are of an uniform 

 fawn-colour. Sometimes the fimbriated margin is entirely absent. 

 Spines at first granular, minute, at length elongated. 



15. H. udam, Fr. [moist Hydnum); effused thin subgelatinous 

 smooth pale watery yellow, spines close unequal simple forked 

 or fimbriated. Fr. Syst. JSIyc. v. \. p. 422. 



On fallen sticks of Ulmus suberosa and Hawthorn. Early autumn. 

 Margate and at Lambley, Notts, Rev. 31. J. Berkeley. — Forming elong- 

 ated patches, 4 — 5 inches long. My specimens agree with Fries' cha- 

 racter in every respect, except that most of the spines are simple. 

 When dry, it is yellowish towards the margin, the more central parts 

 being of a pale fawn-colour. 



10. SiSTOTREMA. Pers. Slstotrema. 



Hymenium somewhat distinct from the pileus, composed of 

 irregularly disposed, curved and gyrose, lamellate teeth. — 

 Name ; from sisto, to place ^ and r^viiia, ?i pore, from the arrange- 

 ment of the pores. 



1. S. conjluens, Pers. {confluent Sistotrema). Pers. Syn, 

 p. 551. Fr. Syst. Myc. v. 1. p. 426. Grev. Ft. Ed. p. 405. 

 Scot. Crypt. Fl. t. 248. — Hydnum sublamellosum, Bull. t. 453. 

 /. 1. Sow. t. 112. 



In woods, on the ground and on'sticks, Szc. Rare. Clapham wood, 

 3Ir. Abbott. Foxhall near Edinburgh, Captain Waucli. — *' Gregarious, 

 often anastomosing or two or three growing into each other, scentless, 

 brittle, whitish at length yellowish or tinged with brown. Stem at- 

 tenuated below, central or lateral, about an inch high. Pileus about 

 1 inch broad, somewhat depressed. Tooth-like plates of the hymenium 

 entire, or jagged." Grev. I. c. This genus is to Hi/dnumywXvAt Doedalea 

 is to Polyporus. There is but one certain species. 



11. Irpex. Fr. Irpex. 



Hymenium concrete with the substance of the pileus, torn 

 into distinct spines disposed in rows or in a reticulate manner, 

 their bases connected together by lamellate, sinuous or porous 

 folds. Asci slender situated only on the toothed processes. — 

 Name, irpex, a ralie or harrow, which the spines of the hy- 

 menium somewhat resemble. 



1. I. pendulus, Fr. (pendulous Irpex) ; pilei membranaceous 

 plicate yellow, their bases produced, the margin and the com- 

 pressed torn teeth which are disposed in rows white. Fr. 

 El. V. \. p. 143. — Hydnum pendulum, Fr. Syst. Myc. v. 1. 

 p. 413. A. S.p. 261. t. 6./ 7. (flde Fries). 



On pine-wood. Scotland, Klotzsch, in Hook. Herb. March, 1831. 

 — Pilei 1 inch or more broad, very thin, somewhat resembling paper, 

 capable of being folded up or stretched, concrete or infundibuliform. 



