KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 269 



f. typica, and resembles rather much a Coilonema. The form in question is not in- 

 dependant, approaching sometimes so nearly to the typical that it is difficult to draw 

 a limit between them. The form distributed in Aresch. Alg. Scand. Exsicc. under N:o 

 321 is the most common in the Arctic Sea proper. 



Habitat. This species is chiefly litoral in the Norwegian Polar Sea, occasionally 

 sublitoral as in the other parts of the Arctic Sea. It does not descend to any consider- 

 able depth, growing usually epiphytical on other algae, mostly Chordaria, not seldom 

 attached to stones. It occurs on the coast of Norway in rather considerable masses 

 and flourishes at exposed as well as sheltered points. On the coast of Norway it bears 

 zoosporangia during all the summer, at least to the middle of September. On the coast 

 of Spitzbergen I have collected it with such organs both in summer (August) and 

 winter (December). 



Geogr. Distrib. Known only from the Polar Sea north of the Atlantic. It is 

 most abundant and most richly developed in the Norwegian Polar Sea. The most 

 northern point is Musselbay on the north coast of Spitzbergen, Lat. N. 79° 53'. 



Localities: The Norwegian Polar Sea: Nordlanden, common and abundant; Fin- 

 marken: Gjesvser (f. fragilis) abundant, Magero Sound and Oxfjord (f. typica) common 

 and abundant. 



The Greenland Sea: local and scarce on the north-west and west coasts of Spitz- 

 bergen. 



The Murman Sea: the coast of Russian Lapland and Samoyede-land; on the west 

 coast of Novaya Zemlya rather common, but not abundant. 



The White Sea: probably comm,on and abundant (cp. Gobi I. c. p. 11). 



Baffin Bay: the west coast of Greenland: Lichtenau. 



Dictyosiphon foeniculaceus (Huds.) Grev. 

 Alg. Brit. p. 66. Conferva foenicnlacea Hdds. El. Angl. p. 164. 



f. typica. 



Descr. Dictj'osiphon foeniculaceus Aresch. Obs. Phyc. .3, p. 30. 



Pig, >} u )) Phyc. Scand. t. 7. 



Exsicc. » » >> Alg. Scand. exsicc. N;o 10.3 et 319. 



f. fiaccida Aresch. 



Subspec. Dictyosiphon fiaccidus Aresch. Bot. Not. 1873, p. 169. 

 Descr. Dictyosiphon foeniculaceus var. fiaccidus Aresch. Obs. Phyc. 3, p. 31. 



Syn. Chordaria flagellifovrais var. J. G. Ag. Gronl. Alg. p. 110; sec. spec. 

 Dictyosiphon foeniculaceus /3 Aresch. Phyc. Scand. p. 370. 

 » » CR0.4.LL, PI. Disc. p. 458. 



» » Dickie, Alg. Sutherl. 1, p. 141; Alg. Cumberl. p. 237; Alg. Nares, p. 7. 



» » Gobi, Algenfl. Weiss. Meer, p. 66. 



» » Harv. F1. West-Esk. p. 49. 



» B Kjellm. Spetsb. Thall. 2, p. 38, excl. subspec. 2; Algenv. Murm. 



Meer. p. 47. 

 » » Kleen, Nordl. Alg. p. 34. 



