HEL VELLAOBJS. 



287 



immediate result of this process of fertilization is the bud- 

 ding out and upward growth of a large number of hyphas from 

 beneath the carpogonium 

 (B, Fig. 194) ; these form 

 a dense felted mass, from 

 Avhich, eventually, there 

 rise vertical, closely 

 crowded hyphae, which 

 form the hymenium (A, 

 h, Fig. 19G). In the ter- 

 minal portions of certain 

 of the vertical hyphse 

 the protoplasm condenses 

 around certain points, and 

 thus gives rise to asco- 

 spores (B, a to /, Fig. 

 196). In this genus (Pe- 

 ziza), as well as most 

 others of this order, the 

 ascospores are always eight 

 in each ascus. At matur- 



FlG 



FIG. 196. 



Fig. 195. Sexual organs of Pfsiza oinphalodes. The two spherical carpogonia have 

 each a crooked trichogyne, and to each trichogyne U applied the swollen end of the 

 curved antheridium. Much magnified. After Tillage. 



Fig. 196. Pesiza convexula. A, vertical section of the whole plant ; h, hymen- 

 ium ; , Bterile tissue forming a margin, n, and giving off below fine hyphae which 

 pass into the soil, x 20. B, vertical section of n portion of the hymenium ; a to/, 

 asci, with ascospore* in various stages of devrlopment, intermixed with slender 

 paraphyi-es ; sh, sub-hymenial hyphic. x 550. After Sachs. 



ity the ascospores escape by the rupture of the walls of the 

 asci, this generally taking place at the upper or free end. 



