738 



TUBEEACEI. 



Order XXIX. TUBER A CEI. 



Subterranean. Hymenium waved and sinuate, often intricate 

 and closely packed. 



This differs from the Order vii. Hyxjogcei, in that the eporidia are contained 

 in asci. 



Sporidia more or less elliptic — 



Peridium rough. Asci saccate . . . . 



Peridium warty. Hymenium lacunose . 



Peridium warty, opening above. Asci cylin- 

 drical 



Sporidia globose — 



Integument smooth. Asci clavate . 



Integument warty, opening above. Asci cla- 

 vate 



Integument papillose. Asci oblong 



Integument cottony. Asci cjdindrical 



Integument downy. Asci elliptic . 



Hymenium exposed. Asci linear 

 Sporidia globose, with radiating threads, starchy — 



Peridium convolute. Asci saccate . 

 Sporidia concentric, at length dusty — 



Integument hard. Asci nearly globose . 



Tuber. 

 Balsamia. 



Genea. 



Choiromyces, 



PachyphlceuS' 



Hydnotrya^ 



Stephensia. 



Hydnoholites. 



S^phoerosoma. 



Amylocarpus. 



Elaphomyces. 



Gen. 309. 



Figs. 343. 



2236. 



TUBER, Mich. 



Asci short, saccate, disposed in sinuous veins ; 

 sporidia elliptic, reticulate, often echinulate ; pe- 

 ridium warty or tubercled, rarely smooth, with- 

 out any definite base. — Myc.p. 221. Tul. Hyp. 

 p. 133. Vitt. Tub. p. 131. Berk. Outl.p. 376. 



(Figs. 343, 344 sporidia.) 



Sect. A. — Epispore alveolate. 

 Tuber sestivuxn. Viit. " Common Truffle." 



Rounded, irregular, large, 1-2 inches or more in diameter, black- 

 brown, verrucose ; warts large, polygonal, pyramidal, and trans- 

 versely striate ; veins very numerous, indistinct ; flesh whitish, 

 then clay coloured, orpale brown ; asci 4-6 spored; spores ellip- 

 tic, brown, reticulato-alveolate; alveoli few and broad. — Vitt. 

 Tub. p. 38, t. 2,/. 4. Tul. Hyp. t. 7,/. 3. Corda Icon. vi. 1. 18,/. 



