HELIOTROPISM OF ASCI IN DISCOMYCETES 323 



bohemica ^ sharply turned at their ends through an angle of 

 about 45° ; (3) an enlarged outer part of an ascus of Helvella 

 sulcata 2 turned at its end through an angle of 40° ; and 



Fig. 161. — Anotlier fruit-boiy of Gyromitrd eiculenta. The 

 folds in tlie hymenium are well developed. If the asci 

 are heliotropic, as in tlie Morchellaceae, those on the 

 sides of tlie fokls could readily slioot their spores away 

 fronri tlie fruit-body. Piiotographed at Ottawa by 

 W. S. Odell in the spring, 1927. Natural size. 



(4) a discharged ascus of Leptopodia elastica ^ with its operculum 

 in face view very obliquely situated on the ascus end. 



The only member of the Helvellaceae which so far I have in- 

 vestigated is Ptychoverpa bohemica (Corda) Boud., often referred to 

 as VerjM bohemica. The hymenium differs from that of the species 



1 E. Boudier, 1 cones Mycolocjkne, Tome II, PI. 218, d. 



2 Ibid., PI. 229, ij. 3 Ibid., PI. 232, h. 



