274 Marine Algrn of Berwick-on-Tweed. 



A small and rare plant forming dark- coloured spots on the 

 fronds of Castagnea virescens. It grows in the cortical portion 

 of the host plant, and unless carefully looked for would pass 

 unnoticed. The primary branches, composed of irregularly 

 shaped cells, are procumbent, the secondary and fertile 

 branches erect, the plurilocular sporangia clustered, and more 

 or less branched, the whole plant sunk in the tissue of the host 

 plant. 



ECTOCARPUS, Lykgb. . 



Ectocartos velutinus (Grev.) Ktz. 



Spec. Alg., p. 458. — Sphacelaria (?) velutina, Grev., Crypt. 

 Fl. t. 350. 

 Descr. Elachista velutina, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 28b. 



Fxsicc. „ „ Crovan, Alg. Mar. Finist., no. 4. Hohen., 



Alg. Mar. Sice, no. 209. 

 Streblonema velntinnm, Le Jol., Alg. Mar. Cherb., no. 238. 

 Syn. Ectocarpus velntinns, Ktz., Tab. Phyc, v.t. 74 ; Hauek, Meeresalg., 

 p. 326. 

 Elachista velutina, Aresch., Pug. i., p. 236, t. vin. : J. Ag., Spec. 



Alg. i., p. 10. 

 Streblonema velntinnm, Thv.r. in Le Jol., Liste Alg. Mar. Cherb., 



p. 73. 

 Herponema velutina, .7. Ag., Till. Alg. Syst. IV., p. 56. 

 Hub. On the thongs of Himaiithalia lorea. June — Oct. Not uncom- 

 mon. Berwick Bay, Greenses, Sharper Head, Burnmonth, 

 Holy Island. 



Ectocarpus terminalis, Ktz. 

 Phyc. Germ., p. 236. 

 Descr. Ectocarpus terminalis, Hauck, Meorosalg., p. 325. 

 Fig. „ „ Ktz., Tab. Phyc. v., t. 74 ; Kjellm., Skand. 



Ectoch. och Tilopt., p. 54, pi. 2, fig. 7. 

 Edsicc. ,, „ Holmes, Alg. Brit. Bar., no. 36. 



Syn. Ectocarpus minimus, Ncegrl., in Herb." (Fide Bornet.) 

 Hab. On Gladophora rupestris, Ceramium rubrum, and other small Algae 

 in pools between tide-marks. June — Oct. Bare. Greenses, 

 Bocks north of Sharper Head. 

 A small species forming a fringe on the fronds of Cladophora 

 and other small Algse. The filaments are scarcely an eighth of 

 an inch long, and simple or furnished with a very few short 

 branches given off at wide angles. The plurilocular sporangia are 



