POKOTHELIUM. 177 



adnate, thin, cmstaceous, rather mealy ; warts crowded, snb- 

 globose, mimite, often collapsing at the apex, tmeqiial. 



Grandinia crustosa. Pries, Hym. Eur., p. 627 ; Stev., Brit. 

 Fnng., p. 256. 



On bark of willow, pine, &c., and on Polyporus versicolor. 

 Often forming a crust that extends for several inches. 



Grandinia mncida. Fr. 



Waxy and somewhat gelatinons, effused, snbinnate, pale 

 dnil yellow ; hymenium crowded with rather large, unequal, 

 hemispherical, soft grannies. 



Grandinia mucida, Fr., Elench., p. 217 ; Stev., Fung., p. 255. 



On rotting wood. EflFosed for several inches. Snbgela- 

 tinous when moist, corrugated when dry. 



POEOTHELnjM. Fries (emended), (figs. 14, 15, p. 149.) 



Thin and entirely resupinate, the snrface covered with 

 small warts that eventually become more or less perforated at 

 the apex, basidia tetrasporons, borne on the outer surface of 

 the warts as in Hydnum. 



Porothelium, Fries, Obs. iL p. 272; Stev., Brit. Fung., 

 p. 231. 



The present genus was placed by Fries in the Polyporeae, 

 and considered as showing some affinity with Fistulina in the 

 structure of the pores, which are at first solid, then exca- 

 vated, but in reality the basidia do not line the pores, as in 

 the Polyporeae, but the hymenium covers the outer surface of 

 the warte or projections as in the Hydneae, and the species 

 are very close to certain of the resupinate Hydnums that 

 have the tips of the spines more or less excavated. 



Porothelium Keithii. B. & Br. 



Closely adnate, inseparable, thin, at first subgelatinous, 

 forming patches 1-2 in. across, pale umber, margin very 

 thin, subpulverulent ; warts scattered, short, at length col- 

 lapsing, gelatinous in the centre; spores linear-oblong, 

 5x2/1. 



Porothelium Keithii, B. & Br., Ann. Nat. Hist., n. 1684 ; 

 Stev., Brit. Fung., p. 231. 



On dead fix. Distinguished amongst British species by 



VOL. I. N 



