322 KJELLMAN, THE ALG.E OF THE ARCTIC SEA. 



Localities: The Norwegian Polar Sea: Nordlanden according to specimens in Kleen's 

 herbarium; Finmarken at Talvik, local, but rather abundant. 



Baffin Bay: The west coast of Greenland at Tessarraiut, Ameralik, and Pikitsok, 

 according to specimens in the herbarium of the Copenhagen Museum. 



Rivularia Microscopica Dickie. 

 Alg. Sutherl. 2, p. 193. 

 Descr. Bivularia microscopica Dickie, 1. c. 



Habitat. Found growing on Enteromorpha compressa. 



Locality: The American Arctic Sea: Assistance Bay, »and other localities)), accor- 

 ding to Dickie, 1. c. 



Gen. Calothrix (Ag.) Thur. 



Nostoch. p. 6; Ag. Syst. Alg. p. XXIV; char. mut. 



Calothrix Harveyi nob. 



Descr. et Fig. Calothrix fasciculata Harv. Phyc. Brit. t. 58, A. 



Remark on this species. I share the opinion of Areschoug, pronounced in Phyc. 

 Scand. (p. 439), that Agardh's C. scopuloruni and C. fasciculata are forms (or develop- 

 ments) of the same species, C. scopulorum Web. et Mohr. C. fasciculata Harv. is no 

 doubt specifically distinct from this. I have found the last-named alga at Finmarken, 

 and I propose for it the name of C. Harveyi. Harvey's description of it is satisfac- 

 tory. Only it should be observed that C. Harveyi is sometimes almost simple, some- 

 times richly branched, just as there is to be found of C. scopulorum Web. et Mohr one 

 form that is luxuriant and branching and another that is less luxuriant and only little 

 branching. 



Habitat. This alga forms dense mats several feet in extent on mouldering wood- 

 work at high-water mark. In the Polar Sea it has been found only in sheltered lo- 

 calities. When I collected it in the beginning of September, the hormogonia were in 

 development. 



Locality: The Norwegian Polar Sea: Finmarken at Talvik, local, but abundant. 



Calothrix Scopulorum (Web. et Mohr) Ag. 

 Syst. Alg. p. 70. Conferva scopulorum Web. et Mohr, Raise, p. 195. 

 Descr. Calothrix scopulorum Aresch. Phyc. Scand. p. 438. 



» » » Alg. Scand. exsicc. N:o 139. 



Syn. Schizosiphon scopulorum Kjellm. Spetsb. Thall. 2, p. 58. Algenv. Murm. Meer. p. 67. 



Habitat. The present species in the Polar Sea forms, in conjunction with seve- 

 ral other algae, Rhodochorton Rothii, Chcetophora maritima, Urospora penicilliformis, spe- 

 cies of Codiolum a. o., a thin stratum over stones within the upper part of the literal 



