CERAMIACEA. 231 



high ; stem bristle-like, jointed, opake, veined ; branches 

 numerous, long, simple, alternate, spreading, long below, 

 becoming shorter towards the apex of the plant, often bearing 

 a second series ; plumules much divided, jointed, with a nar- 

 row, egg-shaped outline. Tetraspores tripartite, elliptical, 

 formed in necklace-like strings from the upper branchlets 

 of the plumules. 



This beautiful plant was first discovered on the coast 

 of Devonshire, and has since been collected in Scotland, 

 Ireland, the Channel Islands, and likewise in Sweden. 

 It grows in deep water, and is washed on shore in sum- 

 mer. Its substance is flaccid and gelatinous, and it ad- 

 heres closely to paper. 



Genus CII. CORYNOSPORA. 



!Prond filiform, dichotomous, beset with pinnate branch- 

 lets, contracted at the joints, one-tubed. Favellae near the 

 tips of the side branches, girt with curved, involucral branch- 

 lets, containing many angular spores ; tetraspores solitary, 

 on short stalks, on the axils of the branchlets. — -Coetno- 

 SPOEA, from the Greek koryne, a club-like shoot, and sporos, 

 a seed. 



The only British species belonging to this genus was 

 formerly included in Callithamnion ; the separation is 

 founded on the mode of fructification. There are four 

 or five Continental species. 



Corynospora pedicellata. The pedicellate 

 Corynospora. 



Stem bristle-like, transparent, irregularly branched; 

 branches long, either simple or repeatedly divided in a 

 somewhat forked manner; branchlets alternate, twice or 



