102 CHYLOCLADIA. 



ing successive arcs, attached at intervals to other Algae by short rootlets 

 tipped with disks. Secondary branches spring from the arched ones, either 

 two or three from one point, or else they are solitary and secund : these are 

 regularly constricted into articulations about once and a half as long as 

 broad. * Nearly related to C. kaliformis, from which it is chiefly distin- 

 guished by its creeping habit and small size. The Irish station given in 

 Phyc. Brit, is incorrect. 



4. C. parvula. Ag. ; frond sub-gelatinous, slender, branched 

 in a straggling, sub-dichotomous manner ; branches con- 

 stricted at intervals of equal length and breadth ; capsules 

 ovate. Grev. Alg. Brit. p. 119; Hook. Br. FL ii. p. 298 ; 

 Wyatt, Alg. Danm. No. 72 ; Harv. Phyc. Brit. t. ccx. Chon- 

 dria parvula, Grev. Crypt, t. 346. 



Parasitical on the smaller Algae. Annual. Summer and autumn. Not 

 uncommon. Fronds rising from a mass of fibres, densely tufted, 2 or 3 

 inches long, half a line in diameter, excessively branched and entangled ; 

 branches irregular, opposite or alternate, of various lengths, with or without 

 scattered ramuli, which are slightly attenuated at base ; the tips obtuse ; 

 the whole frond marked, at distances of nearly equal length and breadth, 

 with external constrictions, and furnished with internal septa. Capsules 

 ovate, borne on the smaller branches, and containing a spherical mass of 

 ovate seeds ; tetraspores in the articulations of the branches. Substance soft 

 and somewhat gelatinous. Colour a fine, but fugitive, pinky red. Well 

 distinguished from C. kaliformis by the ramification, the uniformly short 

 articulations, and the shape of the conceptacles. 



5. C. articulata, Huds. ; frond tubular, gelatinoso-mem- 

 branaceous, strongly constricted throughout, as if jointed, 

 much branched in a fasciculato-dichotomous manner ; cap- 

 sules obtusely conical. Grev. Alg. Brit. p. 120; Hook. Br. 

 Fl. ii. p. 298 ; Wyatt, Alg. Damn. No. 73 ; Harv. Phyc. 

 Brit. t. cclxxxiii. Fucus articulatus, E. Bot. t. 1574. 



Between tide-marks, on rocks and the larger Algae. Annual. Summer. 

 Fronds springing from a mass of fibres, tufted, I 6, or occasionally 12 

 inches long, excessively branched and bushy, constricted at regular inter- 

 vals of 2 4 lines, irregularly divided ; main stem somewhat dichotomous, 

 bearing at its constrictions whorls of branches, which again divide dichoto- 

 mously, and bear from their joints opposite or whorled, lanceolate ramuli. 

 The tips of the branches are somewhat fastigiate and the plant has a rounded 

 outline. Capsules conical ; tetraspores in the joints of the ramuli. Colour 

 a fine pinky red, less fugitive than in others of the genus. Substance 

 membranaceous, filled with watery gelatine. 



