54 CLADOSTEPHUS, 



SYNOPSIS OF THE BRITISH GE'.NERA. 



Sub-order 1. SPHACELARiEiE. Frond rigid; each articula- 

 tion composed of numerous cells. 



I. Cladostephus. Ramuli whorled. [Plate 9, A.] 



II. Sphacelaria. Ramuli distichous, pinnated. [Plate 



9,B.] 



Sub- order 2. Ectocarpe^e. Frond flaccid ; each ai'ticu- 

 lation composed of a single cell. 



III. EcTOCARPUS. Frond branching; ramuli scattered. 

 [Plate 9, C] 



IV. Myriotrichia. Jy-owf/ unbranched ; ramuli whorled, 

 tipped with pellucid fibres. [Plate 9, D.J 



Sub-order 1. Sphacelarie^. 



I. Cladostephus. Ag. [Plate 9, A.] 



Frond inarticulate, rigid, cellular, whorled with short, arti- 

 culated, sub-simple ramuli. Fruit elliptical, pedicellate. 

 Spores borne by accessory ramuli. — Name, «Aa3bj, a brancit, 



and (7TE(pof, a crown. 



1. C.verlicillains, Lightf. ; branches slender, ramuli mostly 

 forked, regularly whorled, the whorls at short intervals. — 

 Hook. Br. Fl. ii. /?. 322 ; Wyatt, AUj. Danm. No. 82 ; E. 

 Bot. f. 1718, and /. 2427, /. 2 ; Harv. Phyc. Brit. t. xxxiii. 



In the sea, on rocks and corallines, frequent. Summer and winter. 

 — Filaments 3 — 9 inches high, irregularly dichotoraous, the lesser branches 

 often opposite. Colour a dull olive-green. Mrs. Griffiths notices that in 

 summer the ramuli of this and the following species frequently contain dark 

 grains imbedded in their withered tips, as in the genus Sphacelaria. In 

 winter most of the whorled ramuli fiill off, and the frond becomes clothed 

 with irregularly disposed, slender (accessory) ramuli, which bear numerous 

 lateral, stalked spores, furnished with a transparent border, and containing 

 a dark olive mass. 



2. C. spongiosus, Iluds, ; branches thick and clumsy; ramuli 

 naostly simple, irregidarly whorled, densely imbricated. Hook. 

 Br. Fl. ii. p. 322 ; Wyatt, Alg. Danm. No. 169 ; E. Bot. i. 

 2427, /. 1 ; Harv. Phyc. Brit. t. cxxxviii. 



