Plate LXXVII. 



Fig. 361. CALOTHEIX LUTEOLA. 



Colour. Light green; or (when the colour-cells have dropped out) pale horn-colour. 

 Substance. Very soft. 



Character of Frond. Exceedingly slender threads { filaments) scattered along the 

 stems of the lesser algie, forming a downy fringe. Filaments unbranched; 

 tubular; some containing very narrow, close-set, cylindrical colour-cells, 

 which show through; their division-lines faintly marked; some partially or 

 ^ entirely empty from these having dropped out. 



Measurement. One-tenth, or at most ^ of an inch high! 



Fructification. Minute seeds (zoospores) formed of the colour-cells in the filaments; 



which cells then separate from each other and drop out. 

 Salitat. Appin; but should be looked for elsewhere. On thread-shaped {filiform) 



algaj in tide-pools. 



Fig. 362. CALOTHEIX FASCICULATA. , 



Colour. Very dark, shining green. 



Substance. Velvety; very slippery to walk upon. 



Character of Frond. Minute tufts of very straight, upright, finely-pointed threads 

 (filaments)', forming a spreading velvety layer upon rocks. Filaments not 

 branched; but sometimes surrounded at top with a set of lesser ones lying 

 close against them, branch-Z^X^e; tubular; containing very narrow, close-set, 

 cylindrical colour-cells, which show through; their division-lines strongly 

 marked. 



Measurement. Filaments 3- or -J- of an inch high; the velvety layer indefinite. 

 Fructification. As in the preceding. 



Sahitat. Miltown Malbay, and probably elsewhere. Spreading over the surface of 

 rocks about half-tide level. 



Possibly only (7. scopuloi'um, grown in deeper water. It is taller, straighter, 

 darker, and occasionally appears branched above, as described. 



Fig. 363. CALOTHEIX SCOPULOEUM. 



Colour. A dull, dirty green. 



Substance. Velvety; very slippery to walk upon. 



Character of Frond. Exceedingly minute, upright, wavy threads (filaments)-, often 

 finely tapering; rising from a slimy base; forming a spreading, velvety layer 

 upon rocks. Filaments unbranched; tubular; containing very narrow, close- 

 set, cylindrical colour-cells, which show through; their division-lines indistinctly 

 marked. 



Measurement. One-fifth of an inch high. 

 Fructification. As before. 



Habitat. Our coasts generally. On rocks near high-water mark. Common. 

 79 



