Plate LXIX. 
Fig. 824. CLADOPHORA ALBIDA. 
Colour, Pale, or sometimes bright light green ; whitish, and generally without gloss, when dry. 
Substance. Soft, silky, and very spongy ; retaining water and swelling with it ; soft to the 
touch when dry. 
Character of Frond. Fine tufts of jointed “threads {filaments') excessively branched. Fila- 
ments slenderer than human hair ; crowded with long irregular branches, spreading 
on all sides, and several times re-branched ; the upper branches straight ; spreading ; 
often opposite. These set with straight, upright, short, opposite, or secund branch- 
lets ; one issuing from each joint, and occasionally bearing a second set. 
Joints. Four or five times longer than broad ; filled with light green colouring matter 
{endochrome). 
Measurement. From 2 to 6 inches long. 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the joints, and in 
due time bursting through them. 
Habitat. Southern shores of England and Ireland. On rocks and algse between tide-marks, 
usually near low-water mark. Not uncommon. 
This Cladophora approaches nearest to C. refracta in appearance; hut it is a much taller 
plant when well grown. Moreover, it is distinctly spongy^ which C. refracta is not; audit has 
a peculiarly soft woolly feeling when dry, which distinguishes it from all the genus but 
C. lanosa. 
Fig. 325. CLADOPHORA FALCATA. 
Colour. A peculiarly rich, glossy green. 
Substance. Eigid ; but adhering to paper in drying. 
Character of Frond. Dense tufts of jointed threads {filaments), very much branched. Fila- 
ments thicker than human hair ; nearly uniform throughout ; entangled at the base ; 
irregularly divided ; much curved. Branches zigzag ; curved and twisted all ways ; 
repeatedly forked. The last divisions crowded ; three or four springing together from 
a stem. These all strongly arched in one direction, like a set of curled feathers ; 
their inner faces clothed with branchlets ; some short and blunt ; some longer and 
re-branchleted. 
Joints, Three or four times longer than broad ; filled with dense green colouring matter 
{endochrome). 
Measurement, Three or 4 inches long. 
Fructification. As before. 
Habitat. Dingle Harbour, Kerry. Jersey. On the bottoms of clear rock-pools near low- 
water mark. Not common. 
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