I 
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. 
Habitat. Our shores generally. On rocks and stones between tide-marks. Not uncommon. 
So closely allied to the preceding that it is sometimes impossible to pronounce to which 
species a specimen should he referred. But those with thicker filaments, more numerous 
branchlets, and obtuse tips, may be considered as G. Hutchinsice. 
Fig. 299. CLADOPHORA RUPESTRIS. 
Colour. A rich dark green ; finest in the deepest water 5 fading, after a time, in the herbarium. 
Substance. Eigid ; imperfectly adhering to paper. 
Character of Frond. Thick tufts of jointed threads (filaments) very much branched. Fila- 
ments 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-branchleted ; 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. Very common. 
This is another Cladophora with decided characters. No one can well mistake it for 
another species, if the commonest attention he paid to the descriptions given of its growth. 
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