322 KJELLMAN, THE ALG.?; OF THE ARCTIC SEA. 



Localities: The Norwegian Polar Sea: Nordlanden according to specimens in Kleens 

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



Bafjin 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. 

 Beser. Rivularia microscopica Dickie, 1. c. 



Habitat. Found growing on Enteromorpha comj^ressa. 



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

 ding to Dickie, I. c. 



o 



Gen. Calothrix (Ag.) Thur. 



Nostooh. p. 5; Ag. Syst. Alg. p. XXIV; char. mut. 



Calothrix Harveyi nob. 



Descr. et Fig. Calothrix fasoiculata Harv. Pliyo. Brit. t. 58, A. 



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

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

 ments) of the same species, C. scopulorurn Web. et Mohr. C. fasoiculata 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 tiiere is to be found of C. scopulorurn Web. et Mohr one 

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

 branching. 



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

 work at high-Avater 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 Norioegian Polar Sea: Finmarken at Talvik, local, but abundant. 



Calothrix Scopulorum (Web. et Mohr) Ag. 

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

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



" « » Alg. Scaud. exsicc. N:o 139. 



Syn. Schizosiphon scopulorura Kjellm. Spetsb. Thall. 2, p. 58. Algenv. Murm. Meer. p. 57. 



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

 ral other algaa, Bhodochorton Rothii, Choitoj^hora maritima., Urosj^ora penicilliformis, spe- 

 cies of Codiolum a. o., a thin stratum över stones within the upper part of the litoral 



