KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 281 



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

 point is Gjesvser about Lat. N. 71°. 



Locality: The Nono-egian Polar Sea: Nordlanden pretty comraon; Finmarken local 

 and scarce at Gjesvaär. 



Gen. Pylaiella Bory. 



Diet. Class. 4, p. 393. 



Pylaiella litoralis (L.) Kjellm. 



Skand. Ect. och Tilopt. p. 99. Conferva litoralis L. Spec. Plant. p. 116.5; ex parte. 



Descr. Pylaiella litoralis Kjellm. 1. c. 



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



» KuTZ. Tab. Phyc. 5, t. 76. 



» compactus » » » » » » 



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



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



» » var. rupincola » » » » » 113. 



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



» » Wg. B'1. Lapp. p. 513; ex parte. 



Ectocarpus crinitus Ckoall, Fl. Disc. p. 458 (?). 

 » firmus WiTTE. in Heugl. Reise, p. 284. 



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



» M DiCKiE, Alg. Sutherl. 1, p. 141; Alg. Cumberl. p. 238. 



» » Nyl. et S^L. Herb. Fenn. p. 75. 



» 1) Post. et Rcpr. III. Alg. p. II. 



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



Pylaiella flexilis Rupr. Alg. Och. p. 385. 



» litoralis Gobi, Algenfl. Weiss. Meer. p. 59. 



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



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

 » » Kleen, Nordl. Alg. p. 38. 



» Nordlandioa Rupr. 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 Areshougs 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 algie or fastened 

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



36 



K. Vet, Akad. Handl. B. 20. N:o 5. 



