312 



RESEARCHES ON FUNGI 



Fig. 153. — Morchella esculentn. Upper left and right-hand fruit-bodies, showing 

 the external appearance of the hymenial pits or alveoli. Lower left fruit-body 

 in median vertical section, showing tlie hollow structure of the stipe and pileus- 

 flesh and the depth of the pits. Lower middle fruit-body, a median transverse 

 section througli the pileus. Tlie asci are lieliotropically curved toward the 

 mouths of the pits and, tlierefore, slioot their spores away from the fruit-body. 

 Photographed by the Geological Survey of Canada. Natural size. 



