HELVELLEAE. 457 



Verpa. Pileus drooping, regular, margin entire, 

 thimble-shaped. 



Leotia. Pilens fleshy, discoid; spores obliquely 1-2- 

 seriate. 



Cudonia. Pileus fleshy, discoid ; spores very long and 

 slender, arranged in a parallel fascicle in the ascus. 



Mitrophora. Surface of pileus furnished with stout 

 anastomosing ribs bounding deep, elongated pits ; 

 lower part of pileus free from stem. 



** Pileus adnate throughout to the stem. 



I Spores obliquely 1—2-seriate in the ascus. 



Morehella. Surface of pileus furnislied with stout, 

 anastomosing ribs bounding deep, irregular pits. 



Gyromitra. Surface of pileus covered with rounded, 

 variously contorted folds. 



Mitrula. PUeus subglobose or clavate, surface even. 



tf Spores long and slender, arranged in a parallel fascicle in 

 the ascus. 



Spathularia. Pileus flattened, running duwn the 

 stem for some distance on opposite sides. 



Vibrissea. Pileus capitate ; spores remaining attached 

 to the surface of the pileus for some time after 

 escaping from the asoi. Aquatic. 



B. Spores coloured. 

 Geoglossum. 



