Chordaria.] il,GJE INARTICULATE. 275 



" fresh specimens, when spread upon paper, rendered it transparent as 

 if it had been touched with oil, but in a short time this transparency 

 disappeared." 



3. S. rhizodes, Ag. (root-like Sporochnus); frond rather stout 

 filiform with subdichotomous branches covered with numerous 

 warts of fructification. — Ag. Sp. Alg. v. 1. p. 1.5G. — Chondria 

 rhizodes, Ag. Syn. p. 15. Lyngb. Hydroph. Dan. t. 13, et C. 



paradoxa ejusd. t. 14. — Fucus rhizodes, Turn. Hist. Fuc. t. 235. — 

 Conferva verrucosa, E. Bot. t. 1688. 



In the sea, parasitic on other Algae, on the south coasts of England ami 

 Ireland. 0. Summer, 



Tribe V. Chordarie^e. 



Plants all marine, of an olive-green colour, becoming darker on 

 exposure to the air ; of a cartilaginous and lubricous substance. 

 Foot scutate. Frond continuous, cylindrical, filiform, composed 

 of a solid cellular centre and a dense exterior mass of concentrical 

 filaments. Fructification imperfectly known. Grev. 



12. Chordaria. Ag. Sea- Whipcord. 



Frond filiform, cartilaginous, solid, continuous, composed ex- 

 teriorly of a stratum of concentrical filaments. Grev. Alg. 

 Brit. p. 44. t. 7. — Named from Chorda, a cord or string, conse- 

 quently much too like the following; and older Genua Chorda. 

 Our C.flagelliformis, the type of the present Genus, my valued 

 friend Air. Harvey is inclined to place with the Batrachospern ea 

 in the Confervoideee; but I rather follow Dr. Greville in retain- 

 ing it among the " Inarticulate" with which the internal 

 structure and texture of the stem most accord-. 



1. C. flagellif&rmis, Ag. (common Sea-Whipcord); frond 

 throughout equal filiform branched, branches long mostly simple 

 and distichous, Beeda naked among the concentrical filaments. — 

 Ag. Syn. p. 12, Sp. Alg. v. \.j>. 1<><>. Grev. Alg. />>it. />. 44. 

 /. 7. — Gigartina fiagell., Lamour. — Fucus fiagell., 11. Don. t.650. 

 Turn. Syn, Fuc. p. 335, Hist Fuc. t. 85. E, Bot t. 1222. 



Sea-coast, on rocks and stones. ©. Bummer. — 1 — •'» feet long, very 

 slender, olive-brown, almost black when dry. " Fructification," ac- 

 cording to Capt. Carmichael, K external, consisting of obovate brown 

 spoii.lia, mixed with clavate jointed filaments, covering the whole Bur- 

 face of this frond."— The same acute observer remarks, that then- is 

 little or no vestige of the filament* in the young plants, and their deve* 

 lopement appears to keep pace with that of the sporidia. 



Tribe VI. Dn rYOT&s. 



Plants all mo rim. of on olin -green colour, m>/ changing on 

 tun to tin air, of a membranaceous Jlexibu substance (rarity 

 cartilaginous) and reticulated tti Root eith 



