152 



MYCOLOGY 



Fig. 52. — A, Tuber cuslhmm fruit-body; B, Tuber magnaium fruit-body; C, Tuber 

 brumalef. melanosporum, section through fruit-body; D, Tuber excavatum, section of 

 fruit-body; E, Tuber astivum f. mesentericum, piece of fruit-body near pcridium en- 

 larged; G, piece of Tuber excavatum enlarged; H, Tuber rufum, fruit-body magnified 

 showing asci and ascospores; J, Tuber brumale, ascia with spores; K, Tuber magnatuni', 

 ascus with spores. {See Die natUrlichcn PJlanzenfamilien I. i, p. 287.) 



