262 BRITISH SEA-WEEDS. 



Cladophora diffusa. The diffused Cladophora. 



Fronds growing in lax tufts, rigid, bristly, much branched, 

 from a few inches to a foot long, of a dark-green colour 

 when young, becoming paler and yellowish when mature ; 

 branches long, distant, irregular, alternate or forked ; 

 branchlets few, simple, secund, confined to the upper divi- 

 sions of the branches ; cells about three times the length 

 of their diameter, uniform throughout the frond. 



This species grows on rocks and in pools, between the 

 tide-marks, and is a summer annual. It resembles 

 C. Hutchinsice, and probably these two forms are only 

 different states of the same plant. I am inclined to 

 believe that both are specifically identical with C. Icete- 

 virens. 



Cladophora Hutchinsise. Miss Hutchins's 

 Cladophora. 



Fronds growing in tufts, rigid, bristly, much branched, 

 from a few inches to a foot long, of a glaucous green colour 

 and crisp texture ; branches long, curved or zig-zag, distant, 

 irregular, alternate or forked ; branchlets few, alternate or 

 secund, simple, or with short shoots on their inner sides, 

 very blunt at the tip; cells about twice the length of 

 their diameter ; joints of the frond constricted. 



This plant grows on rocks in deep tide-pools during 

 summer. It is annual, and rare. 



Cladophora Macallana. M'Calla's Cladophora. 



Fronds rigid, bristly, brittle, much branched, rolled to- 

 gether in bundles, from a few inches to a foot or more long, 

 of a bright grass-green colour ; branches bent, somewhat 

 zig-zag, of unequal lengths, irregularly disposed ; branchlets 



