258 Marine Algce of Berwick-on-Tweed. 



Ulothrix discifera, Kjellm. 



Spetsb. Thall. Bihang. till Kongl. Svenska Vetenskaps — 

 Akademiens Handlinger Band 4, no. 6, p. 52. t. 5, fig. 10-14 

 (Ex ipso Kjellman.) 

 Descr. Ulothrix discifera Kyellm., I.e. 



Fig. „ „ „ „ Tab. Nost. vii., fig. 8. 



Hab. On rocks from high-water mark to half-tide level. Jan. — Feb. 

 Rare. Rocks north of Dodd's Well, Sharper Head, Spittal, 

 Scremerston. 

 A pretty species easily distinguished, under the microscope, 

 from all other British species of Ulothrix. The fronds, composed 

 of a single row of cells, which are simple below, but vertically 

 divided into two or more parts above, are constricted at irregular 

 intervals. Altogether the plant reminds one more of a Schizogonium 

 than an Ulothrix. 



KHIZOCLONIUM, Ktz. 



Ehizoclonium riparium (Eoth) Harv. 



Phyc. Brit. — Conferva riparia, Roth, Cat. Bot. in., p. 216. 

 Descr. Rhizoclonium riparium, Harv., I.e., Farlow, Mar. Alg., p. 49. 

 Fig. „ ,, Harv.-, I.e. pi. 238; Farlow, I.e. pi. in., 



fig. 2. 

 Exsicc. Conferva tortuosa, Wyatt, Alg. Damn., no. 190 (non Conf. tort. 

 Dillw.) 

 Conferva riparia, Jurgenx, Alga? aquat., Dec. 2. no. 7. 

 Syn. Ehizoclonium salinnm, Ktz., Phyc. Germ. ; Id. Spec. Alg., p. 384 ; 

 Le Jol., Liste, p. 58. 

 Conferva riparia, Ag., Syst., p. 106 ; Harv., in Hook Br. Fl. n., p. 



359 ; Johnston, Fl. Berwk. n., p. 254. 

 Rhizoclonium obtnsangnlnm, Ktz., Phyc. Gen., p. 261. Id., Tab. 



Phyc. m. t. 71. 

 Conferva perreptans, Carm., Harv., in Hook Br. Fl. n., p. 352. 

 Hab. On mud-covered rocks near high-water mark, and along the banks 

 of the Tweed within the influence of the tide. All the year. 

 Very common. Berwick Bay, Spittal, Scremerston, Holy 

 Island, Burnmouth, &c. 

 I suspect that Berkeley's Conferva arenicola is only a form of 

 this or the next species. 



Ehizoclonium Kochianum, Ktz. 



Phyc. Germ. Id. Spec. Alg., p. 387. 

 Dexcr. Ehizoclonium Kochianum, Farlow, Mar. Alg. New Eng., p. 49. 



