Plate LXIV. 



Fig. 298, CLADOPHORA DIFFUSA. 



Colour. A dark or full green. 



Substance. Generally^ rigid and bristling when fresh; occasionally soft. 

 Imperfectly adhering to paper. 



Character of Frond. Loose tufts of jointed threads (filaments) ; much 

 branched. Filaments as thick as horse-hair; very waving; distantly 

 set with long, irregularly sub-divided, occasionally forked branches. 

 Branches furnished towards the top with a few secund, simple 

 branchlets. 



Joints. Three or four times longer than broad; nearly uniform throughout; 

 filled with dark-green colouring matter [endochrome) ; the partition- 

 lines [dissepiments) contracted. 



Measurement. From 6 to 10 inches long. 



Fructification. Minute seeds [zoospores) formed of the colouring matter in 

 the joints; and in due time bursting through them. 



Hahitat. Our shores generally. On rocks and stones between tide-marks. 

 Not uncommon. 



So closely alUed to the preceding that it is sometimes impossible to pronounce 

 to which species a specimen should be referred. But those with thicker fila- 

 ments, and more numerous branchlets, and obtuse tips, may be considered as 

 G. HutchinsicB. 



Fig. 299. CLADOPHORA RUPESTRIS. 



Colour. A rich dark green; finest in the deepest water; fading, after a 

 time, in the herbarium. 



Substance. Rigid; imperfectly adhering to paper. 



Character of Frond. Thick tufts of jointed threads (filaments) very much 

 branched. Filaments slender, straight, bushy; set with very upright, 

 rod-like, crowded branches, sometimes re-branched. Branches densely 

 clothed with equally upright, opposite or tufted, rod-like branchlets, 

 which are again re-bran chleted; tips pointed. Angles of branching 

 [axils) so narrow that the branches lie almost close against the stems 

 whence they spring. 



Joints. Three or four times longer than broad; filled with dark-green 

 colouring matter [endochrome) ; in drying, the alternate ones often 

 shrink considerably. 



Measurement. From 3 to 6 inches long. 



Fructification. Minute seeds [zoospores) formed of the colouring matter in 

 the joints; and in due time bursting through them. 



Habitat. Our shores generally. On rocks between tide-marks, and beyond. 

 Yery common. 



This is another Cladopliora with decided characters. No one can well mistake 

 it for another species, if the commonest attention be paid to the descriptions 

 given of its growth. 



53 



