Plate LXVIII. 



Fig. 318. KHIZOCLONIUM CASPARYI. 



Colour. Light, bright yellow-green; fading very dull in the herbarium. 



Substance. Soft and delicately woolly; a peculiarity it retains in the herbarium. 



Character of Frond. Long, very slender, jointed threads {filaments) lying flat on the 

 sides of rocks, clothing them with a fine close fleece. Filaments entangled, 

 curved, here and there angularly bent ; and sending out from the angles short, 

 horizontal, thorn-like, jointed, colourless fibres, which sometimes lengthen into 

 true branchlets, containing colouring matter [endoclirome). 



Joints. From two to six times longer than broad. 



Measurement. From 1 to 3 inches long. 



Fructification. Minute seeds {zoospores) formed of the colouring matter in the joints, 



and in due time bursting through them. 

 Habitat. Falmouth, and Penzance. 



It will be seen, by comparing the descriptions, that except in the greater 

 slenderness of the threads, and occasionally greater length of the joints, there 

 is no difference between this plant and JS. rqyarium. And Dr. Harvey says 

 that joints of different lengths are sometimes found even on the same threads. 



Fig. 319, CONFERVA TORTUOSA. 



Colour. Pale, full, or dark green, in different specimens. 

 Substance. Eigid. 



Character of Frond. Slender, closely-interwoven, jointed threads; (filaments) ; 

 forming a fleecy web upon rocks or algse. Filaments about the thickness of 

 horse-hair; very much and stiffly curled and twisted; unbranched. 



Joints. Twice or thrice longer than broad; filled with green colouring matter 

 {endochroine). 



Measurement. The fleecy web from an inch to several feet in diameter. 

 Fructification. As before in Bhizoclonium (and Cladhophora). See under Fig. 318. 

 Habitat. Our shores generally. On rocks and algae at half-tide level. Very common. 



Fig. 320. CONFERVA IMFLEXA. 



Colour. Bright green. 

 Substance. Soft and delicate. 



Character of Frond. Very slender, densely-interwoven, jointed threads; forming a 

 fleecy web upon rocks; or little tutts among the branches of other algae. Fila- 

 ments as fine as human hair (half the thickness of C. tortiiosa)\ entangled 

 but not stiffly twisted; unbranched. 



Joints. About as long as broad; or a trifle longer. 



Measurement. Indefinite, from half an inch to a foot. 



Fructification. As before. 



Habitat. Our coasts generally. On rocks and alga? between tide marks. Not 

 uncommon. 

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