Marine Algw of Berwick-on-2\veed. 259 



Exsicc. Conferva arenosa, Cm., Alg. Mar. Finist., no. 355. 



Conferva implexa, var. Aresch., Alg. Scand. Exsicc, no. 187. 

 Ehizoclonium Kochiarmm, Le Jol., Alg. Mar. Cherb., no. 236. 

 Hab. Muddy rocks near low-water mark. Aug. Very rare. Berwick 



Bay. 



A much more slender species than the preceding, and usually 



more yellow in colour. It forms thin yellowish layers over 



Rhodochorton Jloridulum and other Algse near low-water mark. 



I have only found the plant once, and then in very small 



quantity. 



Ehizoclonium rigidum, Gobi, 

 Algenfl. Weiss. Meer., p. 85. 

 Descr. Rhizoclonium rigidum, Gobi, I.e., p. 86. 

 Exsicc. Conferva fracta f . longissima subseniplex, Aresch., Alg. Scand. 



Exsicc, no. 273. 

 Syn. Cladophora fracta, Kleen, Nordl. Alg., p. 45. 



Rhizoclonium rigidum, Kjellm., Algae of the Arctic Sea, p. 309. 



Hab. Epiphytic on Sphaceiaria racemosa. Very rare. Berwick Bay. 



My specimens of this species are very small, but seem in other 



respects to agree fairly well with Norwegian specimens of R. 



rigidum kindly sent me by M. Foslie, to whom I am indebted 



for the identification of the plant. 



CLADOPHORA, Kxz. 



Subgenus-SPONGOMORPHA, Ktz. 



Cladophora arcta (Dillw.) Ktz. 



Phyc. Gen., p. 263. — Conferva arcta, Dillw., Conf. Suppl., 

 p. 67. 



Descr. Cladophora arcta, Harv., Phyc. Brit. 

 Fig. ,, „ Harv., I.e. pi. 135. 



Exsicc. „ ,, Le Jol., Alg. Mar. Cherb., no. 145 ; Aresch., 



Alg. Scand. Exsicc, no. 129. 

 Syn. Spongomorpha arcta, Ktz., Spec Alg., p. 417 ; Id., Tab. Phyc 

 iv. t. 74. 

 Cladophora vaucberiaeformis, Ktz., Phyc. Gen., p. 263. 

 Conferva vaucheriformis, Ag., Syst., p. 118. 

 Cladophora centralis, Ktz., Phyc. Gen., p. 269. 

 Conferva centralis, Lyngb., Hydr. Dan., p. 161 ; t. 56 ; Ag., Syst., 

 p. Ill ; Fl. Dan. t. 1777 ; Harv. in Hook., Br. Fl. vol. n., p. 358. 

 Hab. On rocks from half-tide level to low-water mark. All the year. 

 Not uncommon. Berwick Bay. Coves, Holy Island. Greenses. 

 Burnmouth. 



