238 SEAWEEDS 



Plnmaria* Ballia, Antithamnion* Crouania* 

 Spyridia* Carpoblcpharis, Ceramium* Microcladia* 

 Rhodochorton* and Thamnocarpus, those with an 

 asterisk occurring in British seas. The family is of 

 universal distribution in the sea, especially the 

 genera Callithamnion and Ceramium. 



CRYPTONEMIACE.E. 



General Characters. As in the Gelidiece, the 

 fertilised carpogonium emits a relatively long 

 ooblastema filament, which branches copiously in 

 the thallus tissue. Its terminal 

 cells or joint-cells conjugate each 

 with single auxiliary cells, and 

 from these the gonimoblasts 

 spring. In Gdidiem the fila- 

 ment which emerges from the 

 carpogonium is itself the goni- 

 moblast, and its conjugations 

 with thallus cells appear to be of 

 nutritive importance only, while 

 in the Cryptmicmiaccce the fused 

 cells give rise to the gonimoblast. 



Glviosiphoni&z, Gratcloupiece, 

 Dumontiecc, and Nemastomece. 



FIG. 80. Young procarp ,, n P .,- -, ^/^ 



of Gioiosiphonia capiiiaris. These four families, rigs. 71), 

 80, 81, are all characterised by 

 the auxiliary cells being joint cells of secondary or 

 primary filaments, and the carpogonial filaments 

 usually of similar origin. The ooblastema filament 



