KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 323 



zone. It is scarce here, and nowhere occurs in great masses. It has been found 

 both on exposed and sheltered coasts. I have collected speciniens with hormogonia in 

 development on the coast of Spitzbergen in July. 



Geogr. Distrib. Known from the Polar Sea north and north-east of the Atlantic. 

 Its maximum of frequency is on the coast of Norway. Its most northern point is 

 Fairhaven on the north-west coast of Spitzbergen, Lat. N. 79° 49'. 



Localities: The Norioegian Polar Sea: Finmarken at Maasö and Giesv^r, rather 



common and abundant. 



The Greenland Sea: rather common, but in small numbers on the west coast of 



Spitzbergen. 



The Murmnn Sea: local and scarce on the west coast of Novaya Zemlya and 

 Waygats. 



Calothrix Confervicola Ag. 

 Syst. Alg. p. 70. 



Beser, et Fig. Calothrix confervicola Born. et Thur. Not. algol. 1, p. 8 et t. 3.. 

 Syn. Calothrix confervicola GoBi, Algenfl. Weiss. Metr. p. 88. 



Habitat. Found attached to Pldceospora tortilis. 



Locality: The White Sea: Solowetzki Isles (Cfr. GoBi, 1. c.) 



Fam. OSCILLARIACE^ (Ag.) Nordst. 



Pl. Scand. p. 53. Oscillatoriure Ag. Syst. Alg, p. XXIV; lim. mat. 



Gen. Lyngbya (Ag.) Thue. 



Nostoch. p. 4; Ag. Syst. Alg. p. XXV; char. emend. 



Lyngbya Semiplena (Harv.) nob. 



Descr. et Fig. Calothrix seraiplena Harv. Phyc. Brit. t. 309. Cfr. Symploca Harveyi Thur. Nostoch. p. 8. 



Habitat. Found growing on vvood-work within the litoral zone in a sheltered 

 locality, in small numbers. 



Locality: The Norioegian Polar Sea: Finmarken at Talvik, local, scarce. 



Gen. Oscillaria (Bosc.) Thuk. 

 Nostoch. p. 4 et 7; Bosc. seo. Thur. 1. c. 



Oscillaria Su b salsa Ag. 



Oscillatoria subsalsa Ag. Syst. .Alg. p. 66. 

 Descr. Oscillaria subsalsa KtJTZ. Spec. Alg. p. 246. 

 Fig. » » « Tab. Phyc. 1, t. 42, Hg. 5. 



