Ser. Melanospeemeje. Fain. C/wrdariea. 



Plate CXI. 



CHORDARIA FLAGELLIFORMIS, Ag. 



Gen. Char. Frond filiform, much branched, cartilaginous, solid. Axis 

 composed of densely packed, longitudinal, interlaced, cylindrical fila- 

 ments; the periphery, of simple, club-shaped, horizontal, wborled 

 filaments, and long, byssoid, gelatinous fibres. Fructification obovate 

 spores, seated among the filaments of the periphery. Chordaria 

 (Ag.), — from chorda, a cord. 



Chordaria flagelliformis ; frond subsimple, furnished with closely-set, 

 long, simple, filiform branches, ramuli very few or none ; filaments of 

 the periphery club-shaped, the terminal cellule large or small. 



Chordaria flagelliformis, Ag. Syn. p. 12. Lyngb. Hyd. Ban. p. 51. t. 13. 

 Ag. Sp. Alg. vol. i. p. 166. Ag. Syst. p. 256. Hook. Fl. Scot, part 2. 

 p. 98. Grev. Fl. Edin. p. 288. Grev. Alg. Brit. p. 44. t. 7. Hook. Ft. 

 Brit. vol. ii. p. 275. Harv. in Mack. Fl. Hib. part 3. p. 183. Ilarv. Man. 

 p. 45. Wyatt, Alg. Danm. no. 57. Kiitz. Phyc. Gen. p. 332. t. 27. f. 3. 

 Endl. 3rd Suppl. p. 23. 



Gigartina flagelliformis, Lamonr. Ess. p. 48. 



Fucus flagelliformis, Fl. Ban. t. 650. Turn. Syn. vol. ii. p. 335. Turn. Hist. 

 t. 85. 8m. E.Bot. 1. 1222. 



Hab. On rocks and stones in the sea, between tide-marks. Annual. 

 Summer. Common on the shores of the British Islands. 



Geogr. Distr. Abundant on the Atlantic shores of Europe, from Iceland to 

 Trance. Eastern coast of North America. Cape of Good Hope. 



Descr. Root a minute disc. Fronds tufted, from six inches to two or three feet 

 in length, preserving throughout an uniform thickness, of about hall" a line, 

 furnished with a simple or sparingly forked stem, which is densely clothed 

 from its base to its summit with lateral branches, which issue at distances 

 varying from a tenth to half an inch. Branches from six to twenty inches 

 long, cord-like, perfectly simple, and generally naked; but now and then 

 furnished with a few, filiform, often sccund ramuli, widely distant from each 

 other. In the young plant, the brandies are very short, the stem often 

 developing to its full extent, while the branches are rudimentary, in which 

 state it may readily pass for a different species. Spores abundantly pro- 

 duced in the lull-grown plant, formed at the base of the peripheric fila- 

 ments. The structure of the axis is very dense and firm, composed of 

 closely combined interlacing filaments. The filaments of the periphery vary 

 in form as the plant advances in age; when young, they are club-shaped, 

 but in age more or less capitate. Colour very dark brown. Substance 

 cartilaginous, with a slimy coat. It closely adheres to paper, which it 

 stains of a rusty colour. 



