ASCOMYCETES 



36s 



the traces may be seen, and by the time of maturity even the ascus-walls 

 disappear and the perithece contains little but ripe ascospores. 



When the ascospore germinates it produces a mycele, on which there 

 shortly arise upright sporophores with round swollen apices bearing 

 ■numerous short sterigmata over the surface. On the sterigmata chains 

 of acrospores are formed successively, which, proceeding radially from the 



Fig. 304. — Eiirjtium repens de By. A, branch of mycele with sporophore, c, and sterigmata. st ; 

 early stage of carpogone at as. B : spirally twisted carpogone, as, antherid. p, and an envelope- 

 hypha. C, older state with more envelope-hyphEe. _ Z), young sporocarp. E and F, young spo- 

 rocarps in optical longitudinal section. In E the inner wall is beginning to be formed ; 70, the 

 outer wall ; f^ the nner wall and other cells filling space between it and carpogone. G, ascus with 

 spores. //, ascospore of .£". herbarioruvt Lk. (A x igo, the others x 600.) (After de Bary.) 



appx of the sporophore, surround it with a globular mass of acrospores. 

 The course of development is the same here as in the Erysiphese, and 

 generation after generation of acrospores is usually formed in succession 

 without the myceles attaining to the formation again of the sporocarp — 

 this being the result of the external conditions of life of the fungus. 



