K0N6L. SV. VET. AKADEMIENS HANDLINGAB. BAND. 20. N:0 5. 281 



Geogr. Distrib. Known only from the arctic coast of Norway. Its northernmost 

 point is Gjesvaer about Lat. N. 71°. 



Locality: The Norwegian Polar Sea: Nordlanden pretty common; Finmarken local 

 and scarce at Gjesvaer. 



Gen. Pylaiella Bory. 



Diet. Class. 4, p. 39.3. 



Pylaiella litoralis (L.) Kjellm. 



Skand. Ect. och Tilopt. p. 99. Conferva litoralis L. Spec. Plant, p. 1165; ex parte. 



Descr. Pylaiella litoralis Kjellm. 1. c. 



Fig. Ectocarpus litoralis Harv. Phyc. Brit. t. 197. 



» » KiJTZ. Tab. Phyc. 5, t. 76. 



" compactus » » » » » » 



Exsicc. » firmus Abesch. Alg. Scand. exsicc. N:o 24. 



» » f. vernalis Aresch. Alg. Scand. exsicc. N:o 173. 



» » var. rupincola » » » » » 113. 



Syn. Conferva litoralis Gunn. PI. Norv. 2, p. 106 (?). 



» » Wg. pi. Lapp. p. 513; ex parte. 



Ectocarpus crinitus Croall, F1. Disc. p. 458 (?). 

 » firmus WiTTR. in Hengl. Eeise, p. 284. 



» litoralis J. G. Ag. Spetsb. Alg. Progr. p. 2; Bidr. p. 11; Till. p. 28. 



» » Dickie, Alg. Sutherl. 1, p. 141; Alg. Cumberl. p. 238. 



» » Nyl. et S^l. Herb. Penn. p. 75. 



» » Post, et Rupr. 111. Alg. p. II. 



» ochraceus, Zeller, Zweite d. Polarf. p. 84. 



Pylaiella flexilis Kupr. Alg. Och. p. 385. 



'> litoralis Gobi, Algenfl. Weiss. Meer. p. 59. 



» » Kjellm. Vinteralgv. p. 65; Spetsb. Thall. 2, p. 36; ex parte; Algenv. Murm. 



Meer. p. 44; Kariska hafvets algv. p. 28. 

 » » Kleen, Nordl. Alg. p. 38. 



» Nordlandica Eupr. 1. c. p. 386. 

 » pyrrhogon » » » 385. 



» saxatilis » » » 386. 



Remark on the species. The present alga occurs, in the Polar Sea as well as in 

 the Atlantic, in a number of forms differing from one other in size, mode of growth, 

 colour, and branching. As I have not succeeded in drawing any limits between them, 

 I am obliged to place them all under one name. The figures quoted and the speci- 

 mens distributed in Areshoug's Alg. Scand. exsicc, which I have cited, will show 

 some of the forms that I understand by the present name. 



Habitat. This species is usually litoral, occasionally sublitoral in the Norwegian 

 Polar Sea, in the other parts of the Polar Sea it is almost constantly sublitoral. It 

 descends to a depth of several fathoms, growing epiphytic on other algae or fastened 

 to stones, often gregarious in considerable masses, both on exposed and sheltered coasts. 



K. Vet. Akftd. Handl. B. 20. N:o 6. O 



