SS COMMON SEAWEEDS. 



from half-level downwards where sand or mud abides. 

 There probably we notice a reddish fringe, a kind of 

 down, upon the rock left dry by the tide, or like little 

 red cushions under the overhanging brown weed. 

 This is a Callitliamnion . Its fruit was first discovered 

 by Mr. Rails on specimens found at the Land's End. 

 On the coast of Ireland it is torn from rocks by the 

 rough sea and cast ashore, where they are called figs, 

 and collected as manure. 



Fructification. — Tetraspores oval on short stalks on 

 the silky filaments, which are not branched, or rarely 

 so, but forked. 



Callithamnton Rothii — is found in precisely 

 the same situation, and can only be recognized by the 

 fruit, which consists of tetraspores three together at 

 the tips of the branches, and not singly up the fila- 

 ments, as in Callitliamnioji Floridulum. 



Callithamniof Mesocarpum. — Another of these 

 small plants, forming a broad, shaggy, purple crust on 

 rocks at extreme low-water mark. Filaments minute, 

 tetraspores crowded about the middle of the filaments 

 on forked stems. 



I haye now described sixteen of the prettiest and 

 commonest Callitliamnions. Though placed in the 

 division of low-water mark, they range to the half-tide 

 level : they will be found in their greatest perfection 

 when thrown up from the deep sea after a storm. The 



