204 CLADOPHORA. 



broad. E. Bot. t. 2327 ; Harv. L c. p. 358 ; Wyatt, Alg. 

 Damn. No. 96 ; Harv. Phyc. Brit. t. ccxxxv. 



On rocks and the larger Algae in the sea, below half-tide level ; frequent. 

 Tufts 2 6 inches long, pale green, exceedingly dense or spongy, flaccid. 

 Filaments extremely slender, excessively and intricately branched ; the 

 branches very irregular : ultimate ramuli short, patent, opposite or secund, 

 issuing from almost every joint, and occasionally bearing a second set. In 

 the herbarium it fades to a pale yellowish, wholly without gloss, by which 

 character it is best marked from its allies. Joints short. Mrs. Griffiths 

 finds a beautiful plant at Torquay, having many characters in common with 

 C. albida,'but 12 inches long and of a bright yellow-green colour, which is 

 partially preserved in drying. For the present I regard it as a variety 

 of this species. 



16. C. lanosa, Roth ; filaments slender, short, yellow- 

 green, forming dense tufts ; branches virgate, erect, sub-dis- 

 tant, straight, alternate or opposite, with a few alternate or 

 secund ramuli, axils very acute ; lower articulations twice, 

 upper six times longer than broad. E. Bot. t. 2099 ; Harv. 

 L c. p. 358; Wyatt, Alg. Danm. No. 194; Harv. Phyc. 

 Brit. t. vi. 



In the sea, on rocks or, more frequently, on the larger Fuci. Filaments 

 forming small, entangled, woolly tufts, an inch long, pale green, stoloni- 

 ferous below, branches straight and erect, all the axils very acute. In a 

 dry state it is wholly without gloss, faded, except near the tips, where it 

 generally preserves a glaucous green colour. 



17. C. uncialis, Fl. Dan. ; tufts very short, spongy, sim- 

 ple below, above divided into numerous fastigiate, woolly 

 segments ; filaments flexuous, sparingly branched, densely 

 interwoven ; ramuli distant, secund, somewhat pectinate, 

 long, patent or incurved ; articulations 2 4 times longer than 

 broad. Ag. Syst. Alg. p. Ill ; Fl. Dan. t. 771, /. 1 ; Harv. 

 in Hook. Journ. Bot. p. 304 ; Wyatt, Alg. Danm. No. 146 ; 

 Harv. Phyc. Brit. t. ccvii. 



On rocks near low-water mark. Torquay, Mrs. Griffiths. New Castle, 

 coast of Down, Mr. W. Thompson. Katblin, Antrim, Mr. D. Moore. 

 Common at Balbriggan. Tufts an inch high, dark green, spongy, with 

 something the habit of Ectocarpus tomentosus, composed of slender, irre- 

 gularly branched filaments, densely entangled. Certainly nearly allied to 

 the preceding, with some states of which it may, without careful examina- 

 tion, be confounded. 



18. C. arcta, Dillw. ; filaments forming broad, somewhat 

 starry tufts, of a full green colour, much branched ; branches 

 straight, crowded, erect ; ramuli sub-appressed, opposite or 

 alternate ; articulations either uniformly twice as long as 

 broad, or with the lower joints short, the upper very long. 



