KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND. 20. N:0 5. 253 



Habitat. This species lives somewhat gregarious in rock-pools within the literal 

 zone, on exposed as well as sheltered coasts, seldom attached to stones, usually to 

 litoral algae as Gorallina officinalis, Polysiphonia nigrescens, Ahnfeltia plicata, Cladophora 

 rupestris. On the coast of Norway it has zoosporangia during the latter part of the 

 summer, in August and September. 



Geogr. Distrih. Known only from the Norwegian Polar Sea. Its northernmost 

 point is Oxfjord in Finmarken about Lat. N. 70°. 



Localities: The Norwegian Polar Sea: Nordlandeu common according to Kleen; 

 Finmarken local and scarce at Oxfjord. 



Gen. Elachista Duby. 



Mem. Cer, 1, p. 19, sec. J. G. Ag. Spec. Alg. 1, p. 7. 



Elachista fucicola (Vell.) Aresch. 



Alg. Pugill. p. 235. Conferva fucicola Vell. Mar. Plant. N:o 4, sec. Aresch. 1. c. 

 Descr. Elachista fucicola Aresch, Phyc. Scand. p. 377. 

 Fiff- » » » » » t. 9, fig. c. 



Exsicc. » » » Alg. Scand. exsioc. N:o 102. 



Syn. Conferva fucicola Wg. PI. Lapp. p. 514. 



» » Post et Rupr. 111. Alg. p. II (?). 



Elachista fucicola Aresch. Phyc. Scand. p. 377. 

 » » Croall, PI. Disc. p. 458. 



» » Dickie, Alg. Cumberl. p. 237; Alg. Sutherl. 1, p. 141. 



» » Gobi, Algenfl. Weiss. Meer. p. 72. 



" » Kjellm. Spetsb. Thall. 2, p. 31; Algenv. Murm. Mecr. p. 42; Kariska hafvets 



algv. p. 27. 

 » » Kleen, Nordl. Alg. p. 35. 



Habitat. In the Norwegian Polar Sea the present species is litoral; in other parts 

 of the Polar Sea I have always found it sublitoral. It is always attached to other algaB, 

 usually Fuci, but often other species, as Rhodomela lycopodioides, Halosaccion ramenta- 

 ceum, Rhodymenia palmata, Chondrus crispus, Gigartina mamillosa, Porphyra laciniata, 

 Chcetomorpha melagonium. It flourishes both on exposed coasts and in sheltered locali- 

 ties, for instance, in the interior of deep bays. On the north coast of Norway it occa- 

 sionally occurs gregarious and contributes rather essentially to mark the character of the 

 vegetation on ranges of comparatively large extent. On the coast of Spitzbergen I have 

 found that form of the species which has been named f. globosa. It bears sporangia 

 through all the summer on the coast of Norway. At Spitzbergen it has been found 

 with such organs in February, March, July, and August, on the west coast of Novaya 

 Zemlya in July. 



Geogr. Distrib. With the exception of the American Arctic Sea, this species is 

 known l\n all parts of the Arctic Sea. Its most northern point is Musselbay on the 

 north coast of Spitzbergen Lat. N. 79° 53'. 



