MARINE ALGiE. 



73 



LXXXII. Ceramium. 



Frond filiform, one-tubed, articulated; the dissepi- 

 ments coated with a stratum of coloured cellules, which 

 sometimes extend over the surface of the articulation. 

 Fructification : — 1. Sessile, roundish favellae, having a 

 pellucid limbus, containing minute spores ; 2. Tetra- 

 spores either immersed in the ramuli, or more or less 

 external. 



1. Ceramium rubrum. 



B. 



, botryocarpum. 



3. 



, decurrens. 



4. 



, Deslongchampii. 



5. 



, diaphanum. 



6. 



, gracillimum. 



7. 



, strictum. 



8. 



, nodosum. 



9. 



, fastigiatum. 



10. 



, flabelligerum. 



11. 



, echionotum. 



12. 



, acanthonotum. 



13. 



, ciliatum. 



LXXXIII. Spyridia. 



Frond filiform, inarticulate, much branched, and 

 clothed with minute articulated ramelli. Fructification : 



