740 TUBEEACEI. 



2239. Tuber scleroneuron. B.<)'Br. " Hard Truffle." 



Red-brown, cartilaginous, globose, lobate, minutely warted, 

 or nearly smooth, riinose ; veins irregular, broken, springing 

 from the cracks in the peridium ; cinereous towards the centre, 

 red-brown at the circumference ; sporidia red-brown, ovate, 

 minutely cellulose ; odour faintly aromatic. — B. ^' Br. Ann, 

 N.H. no. 582. Berk. Outl.p. 376. 



In the ground. Oct. Bowood. 



" This species differs from T. rvfum, FtV^. in its firmer cartilaginous texture, 

 deep red-brown colour, in the form of its sporidia, which are ovate, not 

 elliptic-eloneate, and iu its fsint aromatic odour. The venation also is more 

 broken and interrupted. Tuber ruftim, Vitt. appears to be its nearest ally. 

 When dried, T. scleroneuron becomes as hard as a piece of wood." 



2240. Tuber excavatum. Vitt. " Hollowed Truffle." 



Subglobose, about an inch in diameter ; peridium discrete, och- 

 raceous, minutely verrucose, firm ; flesh horny, cinereous-red, 

 liver-coloured, or tawny ; veins pallid-ochraceous ; the substance 

 falls away in the centre, so as to leave a cavity, which has an 

 opening at the base of the tuber ; asci numerous, elliptsoid, 2-4 

 spored ; sporidia ellipsoid, yellowish, or pallid- tawny ; epispore 

 largely faveolo-plicate. — Vitt. Tub. t. 1,/. 7. Tnl. Hyp.t. 6,/. 1, 

 t. 17, /. 5. Smith Seem. Journ. Bot. iii. p. 11, t. SO, /. 1-6. Tuber 

 fuscum, Corda. Icon.i. t.7,f. 298. Vittadinion AIontagjiei,Zobel 

 in Corda. Ic. vi. t. 20, /. 142. 



In woods. Eudloe, Batheaston, Leigh "Wood, and Somerset- 

 shire. 



Spores •023--026 m.m. broad, •032--042 long. 



Sect. B. — Episi^ore echinulate. 



2241. Tuber biumale. Nich. " Winter Truffle." 



Tubers more or less regularly globose, 

 black, rough with polygonal warts, at length 

 ^i^^£^^ smooth and naked; the mature flesh blackish- 



?}i^>^^ 8'i'^y> marbled with white veins ; asci nu- 



merous, with 4- 6 spores ; sporidia oblong- 

 Fig. 344. elliptic and echinulate, with rigid spines. — 

 Vitt. Tvb. t.l,f. 6. Till. Hyp. t. 7,/. 2, t. 17, f. 

 3. B. ^ Br. Ann. N.H. xviii. p. 80. Berk. Ontl. 376. Tuber 

 brumal epvlpacbscura odora, Mich. p. 221, i. 102. T.mela^wsporum, 

 Berk. Ann. N.H. no. 320. 



