426 



BOTANY OF THE LIVING PLANT 



invade the Grass-flowers, causing the development of the conidial 

 stage again. The life-history is here essentially the same as before, 

 but with the addition of the resting sclerotium. 



& o 





°%\ 



o~ ^ 



Fig. 323. 



a, b = conidial stage of Claviceps, developed in the flower of Rye. c = sclerotia 

 replacing the grains of the ear of Rye. d, e = germination of the sclerotia in spring. 

 See Text. (After Tulasne.) (From Marshall Ward.) 



The fruit-bodies are very complex in some of the larger saprophytic 

 Ascomycetes. An extreme case is seen in the edible Morel (Morchella 

 esculenta), in which the external hymenial surface is convoluted and 

 thereby accommodates a vast number of asci (Fig. 324). It is possible to 

 refer this to an elaboration of the Discomycetous type, as it is seen 

 in Peziza (Fig. 322). But in the Truffle [Tuber) the equally numerous 



