OR 



237 



short ooblastema process. When the auxiliary cells 

 have been thus fertilised they both divide, and the 

 upper portions give rise to the two gonimoblasts of 

 the cystocarp, while the lower portions fuse with 

 the cells that bear them, and in some cases with the 

 thallus-cell from which the fertile shoot originated. 



oob 



FIG. 79. GloiosipJionin capillaris, fertilisation and development of cystocarp ; 

 stages in order of numbers, a, auxiliary cell of procarpial branch ; ft, basal 

 cell ; h, hypogonous cell of carpogonial branch ; 006, ooblastema in (4) 

 protoplast only ; sp, pollinoid ; t, trichogyne. 



With some slight modifications this process is valid 

 for the numerous genera and very numerous species 

 of Ceramicce. It includes such well-known genera, 

 in addition to Callithamnion* as Lcjolisia, Fpermo- 

 thamnion* SpJiondylothamnioii* Ptilothamnion* 

 Griffithsia* ffalimis* Bornetia* Monospwa* Pleono- 

 sporium* Haloplcgma, Ptilota* Ccmpsothamnion* 



