264 BRITISH SEA-WEEDS. 



visions, straight and erect in the lesser ; branchlets long, 

 erect, secund ; cells about three times the length of their 

 diameter, uniform throughout the frond. 



This species grows between the tide-marks in summerj 

 and is annual. 



Cladophora flexuosa. The flexuous Cladophora. 



Fronds growing in tufts, slender, much branched, from a 

 few inches to haK a foot long, of a pale green colour, and 

 softish texture ; branches somewhat zig-zag, long, of unequal 

 length, the secondary series simple, or set with short, comb- 

 like branchlets on their outer sides ; cells from twice to 

 four times the length of their diameter, those in the lower 

 part of the frond being the shortest. 



This plant was first found by Mrs. Griffiths in tide- 

 pools at Torquay. It closely resembles C. glaucescens, 

 and is probably only a variety of that species. 



Cladophora refracta. The refiexed Cladophora. 



Fronds growing in dense tufts, about three inches high, 

 slender, somewhat rigid, of a glossy yeUow-green colour, and 

 rather harsh texture ; main stems rolled into rope-like 

 bundles ; branches free, spreading, much divided ; branchlets 

 short, recurved, set with short, comb-like, secund rameUi ; 

 cells about twice the length of their diameter. 



This species grows in rock-pools near low-water markj 

 and is a summer annual. 



Cladophora albida. The whitish Cladophora. 



Fronds densely tufted, very slender, entangled into rope- 



