CORALLINACEJE. 125 



exist on the adjacent shores of the Channel Islands. It 

 grows on rocks near low-water mark, and is in perfec- 

 tion in summer. Its colour is a dull, dark purple. 



Lomentaria ovalis. The oval Lomentaria. 



Frond cylindrical, solid, irregularly forked, the lower part 

 naked, the upper beset with simple, elongated, oval, tubular, 

 jointed branchlets. Spores in spherical conceptacles which 

 have a wide transparent border, and are seated on the sides 

 of the branchlets ; tetraspores tripartite, scattered among 

 the surface-cells of the branchlets. 



This is a very distinct species. It has much the 

 appearance of a land plant, with woody, branched stem 

 and soft, succulent leaves. It grows in the deeper rock- 

 pools near low-water mark, and is in perfection in spring 

 and early summer. It is not very common, but I have 

 found it in several localities on the coast of Wales, De- 

 vonshire, the Channel Islands, and elsewhere. It is an- 

 nual. 



Order IX. CORALLINACE^E. 



Frond calcareous, its cells secreting carbonate of lime. 

 Spore-threads in tufts at the base of the conceptacle, se- 

 parating transversely into four spores at maturity. 



Genus XLVII. CORALLINA. 



Fronds calcareous, jointed, mostly pinnate ; nodes very 

 short, transversely striped. Spore-threads pyriform or 

 club-shaped, four-parted, in ovate or urn-shaped concepta- 

 cles, which are formed from the end joint of a branch or 



