270 BRITISH SEA-WEEDS. 



Cladophora unciaiis. The inch Cladophora. 



Fronds slender, from one to two inches high, growing, 

 from a common base, in dense, sponge-like, interwoven, 

 compact or divided, somewhat level-topped tufts ; branches 

 distant, spreading, alternate or secund, set with root-like, 

 jointed fibres ; branchlets few, simple, curved ; axils rather 

 wide ; cells about twice the length of their diameter, nearly 

 uniform throughout the froud ; colour, of a growing plant, 

 bright-green, of a dried specimen, pale yellow-green. 



This species grows on rocks near low- water mark, and 

 is pretty generally distributed round our coasts from 

 Orkney to the Channel Islands. It is very closely allied 

 to C. lanosa, but the tufts are more intimately inter- 

 woven, and less distinctly level-topped; the cells are 

 uniform throughout the frond ; the root-like fibres are 

 more numerous ; and C. unciaiis is usually found growing 

 on rocks, while C. lanosa is almost constantly parasitic. 

 This species should also be laid out in salt water, in order 

 to preserve the endochrome. 



Cladophora Gattyse. Mrs. Gatty's Cladophora. 



" Filaments about an inch long, as thick as human hair, or 

 somewhat thicker, matted together in dense ropy tufts, irre- 

 gularly branched, somewhat dichotomous, the angles 

 rounded ; ramuli few and patent ; articulations very uniform, 

 about once and a half as long as broad ; filled with oliva- 

 ceous (?) or dull green endochrome, and separated by ex- 

 ceedingly narrow dissepiments ; apices on my specimens 

 often broken ; substance membranaceous, adhering to 

 paper." — Harvey. 



This species is named in honour of the talented 

 authoress, who collected the specimens on which it was 



