Marine Algae of Berwick-on-Tweed. 277 



Ectocarpus caespitulus, Holmes, Alg. Brit, liar., uu. 62 (uon /. Ag., 



Alg. Med. nee Kjellm.) 

 Hah. On Algae and rocks between tide-marks. June — Sept. Hare. 



Sharper Head, Burnmouth. 

 A pretty species forming small pencilled tufts on Algse,or move 

 rarely on rocks, in sandy pools between tide-marks. The fila- 

 ments are very slender, an inch to an inch and a half long, 

 tufted, matted below owing to the interlacing of the branches, 

 becoming free and divergent above, the branches numerous, 

 distant, opposite or alternate, given off at wide angles, covered 

 in the lower portion of the tuft with the numerous, oval, sessile 

 sporangia, which give to this part of the specimen a darker 

 colour than the rest of the plant. The articulations at the base 

 of the filaments are from two to three times longer than broad, 

 in the centre, only once or twice and above four or five times. 

 The forifi of this species which grows on rocks differs slightly 

 from epiphytic specimens, the filaments are not so much en- 

 tangled below, are usually longer, and not so tufted in habit, 

 and the sporangia are rather uniformly scattered over the entire 

 specimen and not confined to the basal portion only. 



ECTOCAKPUS FASCICULATUS, IfarV. 



Phyc. Brit. pi. 273. 



Descr. et Fig. Ectocarpus fasciculatus, Harv., I.e. 



Ersicc. ,, ,, Le Jol., Alg. Mar. Cherb., no. 88 ; 



Crouan, Alg. Einist., no. 23. 



Syn. ,, „ J. Ag., Spec. Alg. i., p. 22 ; Klz., 



Spec. Alg., p. 451. 



Hab. On Laniinariae, Himanthaliue, and other Alga) near low-water 

 mark. Not uncommon. May — Oct. Berwick Bay, Burn- 

 mouth, Rocks north of Dodd's Well, Singing Coves. 



ISTHMOPLEA, Kjellm. 



Istumoplea sPtfJiROPHOitA (Harv.) Kjellm. 



Algenv. Murm. Mer., p. 30. — Ectocarpus spheerophorus, 

 Harv. in Hook., Br. Fl. v. 2, p. 326. 

 Descr. Ectocarpus sphaerophorus, Harv., Phyc. Brit.; Fnrloio, Mar. Alo-. 



New Eng., p. 74. 

 Fig. „ „ Harv., I.e. pi. 126. 



Exsicc. „ „ Wyatt, Alg. Danmon., no. 173 ; Le Jol. 



Alg. Mar. Cherb., no. 166 ; Crouan, Alg. Finist., no. 16. 



