242 Marine Algce of Berwick-on-Tweed. 



Rivulaeta Biasoletttasta, Meneghmi '. 



In Zanard, Synop. Alg. in Mar. Adr., p. 42 (1841.) 

 De^cr. et Fig. Schizosiphon Warreniae, Harv., Phyc. Brit., pi. 31G. 

 Syn. Rivularia Biasolettiana, Bornet et Flahault, Revis. Nosfc. Heter., I.e. 

 p. 352. 

 Rivularia Warreniae, Thuret, Essai de Classification cles Nostoch- 



inees, Ann. Sc. Nat. Bot. 6th ser., vol. i., p. 383 (1875.) 

 Schizosiphon Warreniae, Caspcury in Ann. and Mao-. Nat. Hist., 3rd 

 ser. vi., p. 260 t. 8 (1850.) 

 Jlnb. On rocks near high-water mark exposed to the dripping- of fresh 

 water. On the walls of the caves a little to the south of the 

 Needle Eye. All the year. Plentiful. 



ISACTIS, Thuret. 



Isactis plana (Harv.) Thuret, 



Ess. de Class, des Nostoch. Ann. Sc. Nat. 6th ser., vol. i. — 

 Rivularia plana, Harv. in Hook, Br. Fl. it. 

 Descr. Isactis plana, Farlow, Mar. Alg. New Eng., p. 39. 

 Fig. ' ,, ,, Farlow, I.e. pi. II., fig. 1. 



Syn. Dasyactis plana, Ktz., Tab. Phyc. t.. t. 73. 

 Dasyactis salina, Ktz., Tab. Phyc. i. t. 71. 

 Physactis atropurpurea, Ktz. in Le Jol. List, p. 31. 



f. fissurata, Cm. 



Descr. Dasyactis fissurata, Cm., Fl. Finist., p. 116. 



Hah. On rocks between tide-marks. All the year. Rare. Berwick 

 Bay, Sharper Head. 



Distinguished from Rivularia atra, var. confluens, -which it 

 much resembles outwardly, by the filaments of which the frond 

 is composed being- parallel to each 'other not radiating from the 



CALOTHRIX (Ag.) Thuret. 



Calothrix confervicola, (Dillw.J Ag. 



Syst. Alg., p. 70. — Conferva confervicola, Dilhv., Conf. p. '39, 

 t. 8. 

 Descr. Calothrix confervicola, Harv., Phyc. Brit. ; Farlow, Mar. Alg. p. 36. 

 Fig. „ „ Harv. I.e. pi. 254; Farlow, I.e. pi. i., fig. 6. 



Kxsicc. ,, „ Wyatt, Alg. Danmon., no. 229. 



Syn. ,, „ Bornet et Flahault, Revis. Nost. Het. I.e. 



p. 349 ; Bornet et Thur. Not. Alg. i., p. 8, pi. 3. 



