KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 20. N:0 5. 507 
(Gren, Cladophora Kirrz. 
Phyc. gener. p. 262. 
Cladophora Rupestris (L.) Ktrz. 
Phye. gener. p. 270. Conferva rupestris L. Spec. Pl. p. 1167. 
Deser, et ig. Cladophora rupestris Harv. Phye. Brit. t. 180. 
Exsice. Conferva rupestris Arescu. Alg. Seand. exsiec, N:o 126. 
Syn. Cladophora rupestris Dicktr, Alg. Sutherl. 1, p. 143. 
» » Gost, Algenfl. Weiss. Meer. p. 84. 
» » KyeLum. Algenv. Murm. Meer. p. 53. 
Conterva » J. G. Ac. Grénl. Alg. p. 110. 
» » Arescu. Phye. Scand. p. 420. 
» » Nyu. et Sai. Herb. Fenn. p. 75. 
» » Post. et Rupr. Ill. Alg. p. II. 
» » Wea. FI. Lapp. p. 512. 
Halitat. This species is usually litoral, growing within the formation of Pucu- 
cew, sometimes sublitoral, attached to stones, more seldom epiphytic on algw. It oc- 
curs both on exposed and on sheltered coasts, but is more luxuriant and more typi- 
cally developed in unprotected localities. It is gregarious, but not in very great mas- 
ses. Specimens with zoospores have been found on the coast of Finmarken at the 
end of August. 
Geogr. Distrib. It is known from the Polar Sea north of the Atlantic and has 
its maximum of frequency in the Norwegian Polar Sea. The most northerly point 
where it has been taken is on the west coast of Novaya Zemlya. 
Localities: The Norwegian Polar Sea: Nordlanden common and abundant; Tromsé 
amt at Tromsé and René; Finmarken rather common and abundant at Maasé, Gjesvir, 
Oxfjord, and Talvik. 
The Murman Sea: Russian Lapland and the coast of Cisuralian Samoyede-land; 
the west coast of Novaya Zemlya according to Gopi; the west coast of Waygats, only 
a single specimen known. 
The White Sea: rather common and abundant. 
Bajin Bay: the west coast of Greenland at Fiskernws, Sukkertoppen, Claushavn, 
and Godhavn. 
Cladophora Diffusa (Roru) Harv. 
Phye. Brit. t. 130. Conferva diffusa Roru, Cat. Bot. 3, p. 207. 
Descrv. et Fig. Cladophora diffusa Harv. 1. c. 
Syn. Cladophora diffusa Ksevum. Spetsb. Thall. 2, p. 54; Algenv. Murm. Meer. p. 54. 
Habitat. This species grows sublitoral in 2—5 fathoms water on gravelly and 
sandy bottom on exposed coasts. All the specimens from the Polar Sea that I have 
seen were sterile. They were collected during July, August, and September. 
Geogr. Distrib. It is nowhere to be found in any considerable number within 
the Polar Sea. I have seen it more abundant on the coast of Finmarken than any- 
