Ser. MelanospermejE. Fam. Sp/iacelariea. 



Plate XXXIII. 



CLADOSTEPHUS VERTICILLATUS, a 9 . 



Ge>'. Char. Fronds inarticulate, rigid, cellular, whorled with short, jointed, 

 subsimple rarnuli. Fructification; elliptical utricles, furnished with, 

 alimbus, pedicellate, borne on accessory rarnuli. Cladostephus (Ag.) 

 — from ickddos, a branch ; and o-recfros, a crown. 



Cladostephus verticillatus ; branches slender ; rarnuli mostly forked, regu- 

 larly whorled, the whorls at short intervals. 



Cladostephus verticillatus, Ag. Syn. Introd. p. xxv. Lyngb. Hyd. Ban. p. 102. 

 t. 30. Hook. Fl. Scot. vol. ii. p. 89. Grev. Fl. Edin. p. 312. Harv.in 

 Hook. Br. Fl. vol. ii. p. 322. Wyatt. Alg. Damn. no. 82. Harv. in Mack. 

 Fl. Hib. part 3. p. 179. Harv. Man. p. 36. 



Cladostephus myriophylliim, Ag. Syst. p. 169. Ag. Sp. Alg. vol. ii. p. 10. 

 Endl. 3rd Suppl. p. 24. Kutz. Phyc. Gen. p. 294. t. 18. f. 1. /. Ag. Alg. 

 Medit. p. 30. 



Ceramium verticillatum, DC. Fl. Fr. vol. ii. p. 39. Ducluz. Ess. p. 49. 



Conferva verticillata, Light/. Fl. Scot. p. 984 (1777). Huds. Fl. Ang. p. 653. 

 With. Arr. vol. iv. p. 133. Dillw. Conf. t. 55. E. Bot. t. 1718 and 2427. 

 f. 2. Roth. Cat. Bot. vol. iii. p. 309. ? 



Conferva myriophylliim, Roth. Cat. Bot. vol. iii. p. 312. t. 12. Lb. (1806). 



Conferva ceratophyllum, Roth. 1. c. p. 311. 



Fucus verticillatus, Wulf. Crypt, no. 15. 1. 1. 



Hab. On rocks, stones and corallines, within the influence of the tide. 

 Perennial, fruiting in winter. Yery common on the British Shores. 



Geogr. Distr. Atlantic and Mediterranean shores of Em-ope, abundantly. 

 Cape Frio, Brazil, Tilesius. 



Descr. Frond ultra-setaceous, 3-10 inches high, irregularly dichotomous, or 

 subtrichotomous, rigid j branches erecto-patent, slender, slightly incurved, 

 furnished throughout their length, at distances of one or two lines, with 

 whorls of short rarnuli. Ramidi jointed, 1-2 lines long, indexed, furnished 

 near the apex with one or two diverging tooth-like ramelli, thus appearing 

 forked. Joints about as long as broad, longitudinally striate, each stria 

 consisting of numerous cellules. In winter most of the whorled rarnuli fall 

 away, and the surface of the frond becomes clothed with irregularly disposed, 

 slender rarnuli, densely imbricated, of less diameter than those of the sum- 

 mer, with joints once and half as long as broad, and bi-lri-striate. These 

 produce an abundance of lateral, pedicellate utricles, which we regard as 

 the proper fruit of the plant. The apices of the summer rarnuli arc fre- 

 quently distended, and sphacelate, and contain a dark mass, which may be 

 possibly also connected with reproduction. Colour dark olive. 



A well known species, abundant on most of the shores of 



