KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20, N:0 5. 273 
Gen. Cheetopteris Kiirz. 
Phyc. gener. p. 293. 
Chetopteris plumosa (Lynas.) Ktrz. 
J. ce. Sphacelaria plumosa Lynes. Hydr. Dan. p. 103. 
Descr. Cheetopteris plumosa J. G. Ac. Spec. Alg. 1, p. 41. 
Fig. | Sphacelaria plumosa Harv. Phye. Brit. t. 87. 
Chetopteris plumosa Arescu. Obs. Phyc. 3, t. 2, fig. 4. 
» » KyeLim. Spetsb. Thall. 2, t. 2, fig. 2—3. 
Exsicc. Sphacelaria plumosa ArescH. Alg. Scand. exsicc. N:o 107. 
Chetopteris plumosa Ksptum. in Arescu. Alg. Scand. exsice. N:o 408. 
Syn. Chetopteris plumosa J. G. AG. Groénl. Alg. p. 110. 
» » Dicxiz, Alg. Sutherl. 1, p. 141; 2, p. 191; Alg. Cumberl. p. 238; Alg. 
Nares;: piqi- 
» » Gost, Algenfl. Weiss. Meer. p. 63, 
» » Harv. Fl. West-Esk. p 49. 
» » KyeLuM. Vinteralgv. p. 65; Spetsb. Thall. 2, p. 32; Algenv. Murm. Meer. p. 
42, Kariska hafvets algv. p. 27. 
» » KLEEN, Nord]. Alg. p. 35. 
» » Rurr. Alg. Och. p. 378. 
Conferva pennata We. FI. Lapp. p. 512; ex parte. 
Sphacelaria plumosa J. G. Ac. Spetsb. Alg. Progr. 2; Bidr. p. 11. 
» » Croat, Fl. Disc. p. 458. 
» » Katon. List. p. 44. 
» » Lyne. |. c. 
» » Post. et Rupr. Ill. Alg. p. II. 
Habitat. In the Norwegian Polar Sea this species usually grows in rock-pools 
within the litoral zone, occasionally attached to stones within the sublitoral. In other 
parts of the Polar Sea it is almost without exception sublitoral, keeping however chiefly 
in the upper part of this zone. It is usually found in 2—5 fathoms. It is a common 
element of the formation of Laminariacew, but occurs also within other formations. 
It prefers gravelly and stony bottom. At Spitzbergen it is not seldom gregarious, 
occurring in rather considerable masses. It flourishes both in exposed and sheltered 
localities, and is even found far off from the coast. Kieren has collected specimens 
with gametangia in August at Nordlanden. At Spitzbergen it bears reproductive organs, 
zoosporangia and gametangia, from November to May, most plentifully from the middle 
of November to the beginning of March. After the end of March individuals with such 
organs were rare. In other parts of the Arctic Sea I have only had an opportunity 
of examining specimens of this alga in summer and autumn, and at these seasons I have 
always found it sterile. 
Geogr. Distrib. This species is circumpolar, common in the Arctic Sea, and very 
abundant at certain places. According to my observations its maximum of frequency 
and Juxuriancy is in the eastern part of the Greenland Sea on the coasts of Spitzbergen. 
Its northernmost point is in Smith Sound Lat. N. 82° 27. 
—t 
>) 
K. Vet. Akad. Handl. Bd 20. N:o 5. Oe 
