KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 28] 
Geogr. Distrib. Known only from the arctic coast of Norway. Its northernmost 
point is Gjesver about Lat. N. 71°. 
Locality: The Norwegian Polar Sea: Nordlanden pretty common; Finmarken local 
and scarce at Gjesveer. 
Gen. Pylaiella Bory. 
Dict. Class. 4, p. 393. 
Pylaiella litoralis (L.) Kse.u. 
Skand. Eet. och Tilopt. p. 99. Conferva litoralis L. Spec. Plant. p. 1165; ex parte. 
Deser. Pylaiella litoralis Kapium. 1. ce. 
Fig. Ectocarpus litoralis Harv. Phye. Brit. t. 197. 
» » Kurz. Tab. Phye. De itarido- 
» compactus » » » DL DED) 
Exsice. » firmus Arescu. Alg, Scand. exsice. N:o 24. 
» » f. vernalis Argscu. Alg. Scand. exsice. N:o 173. 
» » var, rupincola » » » » » 113. 
Syn. Conferva litoralis Gunn. Fl. Norv. 2, p. 106 (?). 
» » We. Fl. Lapp. p. 513; ex parte. 
Ectocarpus crinitus CroaLL, F]. Dise. p. 458 (?). 
» firmus Wirrr. in Heugl. Reise, p. 284. 
» litoralis J. G. Ac. Spetsb. Alg. Progr. p. 2; Bidr. p. 11; Till. p. 28. 
» » Dicxtk, Alg. Sutherl. 1, p. 141; Alg. Cumberl. p. 238. 
» » Ny. et Sau. Herb. Fenn. p. 75. 
» » Post. et Rupr. Ill. Alg. p. II. 
» ochraceus, ZELLER, Zweite d. Polarf. p. 84. 
Pylaiella flexilis Rupr. Alg. Och. p. 385. 
» litoralis Gosr, Algenfl. Weiss. Meer. p. 59. 
» » KyetuM. Vinteralgv. p. 65; Spetsb. Thal]. 2, p. 36; ex parte; Algenv. Murm. 
Meer. p. 44; Kariska hafvets algv. p. 28. 
» » KLEEN, Nord]. Alg. p. 38. 
» Nordlandica Rupr. |. ¢. 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 ArgsHouc’s Alg. Scand. exsice., 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 alge or fastened 
to stones, often gregarious in considerable masses, both on exposed and sheltered coasts. 
290 
K. Vet. Akad. Handl. B, 20. N:o 5. ob 
