226 



PLANT LIFE. 



The other mode of development produces enclosed spo- 

 rangia. One or more internal cells differentiate and become 

 the mother cells of the spores. The spores, when mature, 



Fig. 227. 



Fig. 228. 



Fig. 227. — A fructification of the morel (Morchella esculenta). The hymenium occu- 

 pies the surface of the depressed areas. Natural size. — After Kerner. 



Fig. 228. — A small bit of a section through the fructification of the ergot {Claviceps 

 purpurea), showing one of the deep, narrow-mouthed pits, P (and part of another), 

 enclosing the asci. From the broken ascus at the right thread-like spores are escap- 

 ing. Highly magnified. — After Tulasne. 



will therefore be enclosed by the adjacent cells of the plant, 

 which may became altered so as to form a sort of special wall 

 more or less different from the tissue which lies farther off. 



