272 BRITISH SEA-WEEDS. [RJiodosj^ermerE. 



Ilab. On rocks, stones, shells, and Algre at low-water 

 mark and deeper. Annual. Spring and summer. We 

 have got it on scallops dredged from deep water in Lamlash 

 Bav. It is found on all the British shores. On the coast 

 of Ayrshire it is in general rather rare ; but in the summer 

 of 1847 it was very abundant, being cast up by every tide. 

 In 1850 it was got in considerable abundance in the west, 

 but not fine. Tine specimens of it were gathered at Dun- 

 bar by Mrs. E. M. Stark. 



It is a very variable plant, but beautiful in all its phases ; 

 some of them remarkably so, with fine arched branches, 

 resembling the New Zealand Chrysimenia secuiulata, only 

 our British plant is not secund. However, it even surpasses 

 the New Zealander in colour, being a fine light pink, wliich 

 it retains in drying. Tlie figures in Hist. Fucorum are 

 good, but those in Phyc. Brit., PL cxiv., are still better. 

 Chrysimenia is distinguished from Chijlocladia by the absence 

 of internal diaphragms dividing the branches into distinct 

 joints. 



Genus LXXYII. CIIYLOCLADIA, Greville. 



Gen. Char. Frond (at least the branches) tubular, constricted 

 at regular intervals, and divided by internal diaphragms into 

 joints, filled with a wateiy juice, and traversed by a few longi- 



