MAEINE ALGM. 



75 



LXXXVI. Seirospora. 



Frond rosy, filamentous. Stem articulated, the arti- 

 culations traversed by jointed filaments. Tetraspores 

 disposed in terminal, moniliform strings. 



1. Seirospora Griffithsiana. 



LXXXVII. Calithamnion. 



Frond brownish red or rosy-red, filamentous. Branch- 

 es and ramuli articulate, mostly pinnate. Fructifica- 

 tion : — 1. Roundish or lobed, berry-like receptacles on 

 the main branches, containing spores ; 2. External 

 tetraspores scattered along the ultimate branches, or 

 borne on little stalks. 



1. 



Calithamnion plumula. 



2. 



„ cruciatum. 



3. 



„ floccosum. 



4. 



,, Turneri. 



5. 



„ barbatum. 



6. 



„ Pluma. 



7. 



„ Arbuscula. 



8. 



„ Brodiaei. 



9. 



„ tetragonum. 



10. 



,, brachiatum. 



11. 



„ tetricum. 



