v] 



LABOULBENIALES 



'75 





Fig. 136. Stiginatomyces Baeri Peyritsch ; development of the perithecium ; a. shows the two-celled 

 receptacle, a single appendage bearing five simple, endogenous spermatial organs, and the beginning 

 of the perithecium; /;. /'. indicate successive stages in the development cf the perithecium; the 

 trichogyne first appears in d. ; in e. spermatia are being shot out and some are attached to the 

 trichogyne; in i. two of the four ascogenous cells are shown, with the superior sterile cell above 

 them, and the primary and secondary inferior sterile cells below; after Thaxter. 



the perithecium. It divides transversely ; the upper of its daughter cells gives 

 rise to the female organ, the lower divides several times (fig. 136^), and 

 ultimately forms the double wall of the perithecium, a function fulfilled by 

 a complex of neighbouring hyphae in Ascomycetes with a richer vegetative 

 development. 



The upper cell, the initial of the female organ, divides, separating the 

 female cell below (fig. 136^) and a cell above, which divides once more to 

 form the terminal trichogyne and the subjacent trichophoric cell (fig. 136^). 



