202 BRITISH SEA-WEEDS. \Ilho(losperme^. 



Spring and summer. Pretty common in Engl an d^ Scotland, 

 and Ireland. 



This species is quite common on the coast of A}Tshire. 

 I long thought that it was a dark- coloured variety of Cer» 

 diaplianum. It is distinguished from that species by its 

 colour, the straight tips of the branches, and still more 

 by the fruit, those clustered favellce which burst from the 

 stem and branches. It is found in rich tufts in early sum- 

 mer on the pier at Saltcoats. It has been gathered by 

 D. L., jun., at Leith. 



14. Ceramium botryocarpum, Greville, 



Hab. On rocks at low water. Annual? 



This was discovered by Miss Amelia Griffiths at Torquay 

 in 1844. It bears the same relation to Ceramium ruhrum 

 that Ceramium Deslongchainpsii does to Cer. dia2ihan7im. 

 It is distinguished from C. ruhrum by clusters of favellae 

 without involucres, bursting from the branches and branch- 

 lets, like clusters of grapes. It was found by D. L., jun., 

 at Saltcoats, in September; and I found it at Ardrossan in 

 November, rich in fruit, dark in colour, and retaining its 

 colour in drying, and adhering well to paper. This makes 

 me question its being annual. Like C. ruhrum j it is a very 



