SUMMARY OF FUNGI 55 



which destroy corn, and the rusts, which have several distinct 

 stages in their life history: (1) the secial or clustercup stage 

 occurs in early summer on leaves, producing seciospores, 

 which give rise to mycelium bearing urediniospores; the 

 uredinial stage grows often upon a different host-plant and 

 bears the teleospores or resting winter-spores, which have 

 thick walls; the teleosporic stage develops in the following 



FIG. 23. Fungi. 1, Bird's nest fungus (Cyanthus vomicosus) ; 2, Morel 

 (.Morschella esculenta) ; 3, cup fungus (Peziza Sp.) 



spring, giving rise directly or indirectly to the secial or cluster- 

 cup stage previously mentioned. The puff balk also belong 

 to the basidiomycetes; the mycelium develops the aerial 

 puffball composed of numerous internal, intertwined, branch- 

 ing hyphse bearing basidia and basidiospores ; the hyphse 

 form a compact outer layer or peridium which is parchment- 

 like in texture. 



