Plate LXVI. 
Fig. 306. CLADOPHORA REPENS. 
Colour. Dark green. 
Substance. Rigid ; spongy. 
Character of Frond. Short, dense, cushion-shaped, or globular tufts of jointed threads 
{filaments). Filaments slender ; closely matted together ; rising from root-like 
fibres ; slightly branched. Branches simple or forked ; upright or oddly bent ; bare, 
or clothed with a few distant, secund branchlets. 
Joints. From ten to twenty times their width ; cylindrical throughout ; i. e. not swollen 
upwards like those of C. Brownii; filled with green colouring matter {endochrome). 
Measurement. Tufts an inch or 2 in diameter. Filaments scarcely J an inch high. 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the joints, and in 
due time bursting through them. 
Habitat. Jersey. Once picked up there after a gale. 
Fig. 307. CLADOPHORA NUDA. 
Colour. Dark green ; or olive when dry. 
Substance. Somewhat rigid. 
Character of Frond. Loose tufts of jointed threads {filaments)., sparingly branched. Filaments 
slender ; very straight ; here and there forked {dichotomous). Branches set with a 
few scattered, very upright, rod-like, close-lying branchlets ; the angles of branching 
{axils) being very narrow. Uppermost branchlets often opposite and long, so that 
the tips of the branches appear three-forked (not expressed in the plate). 
Joints., Six or eight times longer than broad ; filled with green colouring matter {endochrome). 
Measurement. Two or 3 inches high. 
Fructification. Minute seeds (zoospores) formed of the colouring matter in the joints, and in 
due time bursting through them. 
Habitat, Portstewart. On basalt rocks in the sea. Unknown elsewhere, and only once seen 
there. 
Fig. 308. CLADOPHORA LANOSA. 
Colour. Yellow-green ; fading pale, and quite without gloss when dry. 
Substance. Soft ; spongy. 
Character of Frond. Short, dense, globular tufts of jointed threads {filaments) ; sparingly 
branched, forming a circle when laid out. Filaments hair-like ; woolly ; matted 
together ; throwing out fibres from the lower joints. Branches straight, rod-like, 
alternate or rarely opposite ; set with a few alternate or secund branchlets. Angles 
of branching {axils) very narrow. 
Joints. The lower ones twice, the upper six times as long as broad ; filled with pale green 
colouring matter {endochrome). 
Measurement. An inch high. 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the joints, and in 
due time bursting through them. 
Habitat. Our coasts generally, but prefers the north. Parasitic on various alga; ; often on 
Polyides rotiindus ; occasionally on rocks. Common, 
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