KONGL. SV. VET. AKADEMIENS HANBLINGAR. BAND. 20. N:0 5. 123 



Polysiphonia fastigiata (Roth) Grev. 

 PI. Bdinb. p. 308; Ceramiura fastigiatum Eoth. F1. Germ. 3, p. 463, 

 Descr. Polysiphonia fastigiata J. G. Ag. Spec. Aljr. 2, p. 1029. 

 Fig- » » Harv. Phyc. Brit. t. 299. 



Esesicc. » » Akesch. Alg. Scand. exsico. N:o 4. 



Syn. Conferva polymorpha Gdnn. P). Norv. 2, p. 92; ffde. syn. 

 » » Wg. pi. Lapp. p. 511. 



Hutchinsia fastigiata Lyngb. Hydr. Dan. p. 108. 

 Polysiplionia » J. G. Ag. Spetsb. Alg. Bidr. p. 11. 



» » Aresch. Phyc, Shand. p. 278. 



» » Kjellm. Spetsb. Thall, 1, p. 9. 



Habitat. This plant belongs to the litoral zone and appears to attach itself almost 

 exclusively to OzothalUa nodosa. When growing, as happens sometimes, on fragments 

 of this species torn off and carried into deep (10 — 15 fathoms) water, it becomes less 

 densely branched, finer, longer, and less corymbose, the axes at the same time tapering 

 more strongly towards the top. Such specimens, differing rather much in habit from 

 the typical form, I have found at Maaso in Finmarken. The present species is pelagic, 

 avoiding at least deep bays, and somewhat gregarious. According to Kleen, it bears 

 sporocarps and tetrasporangia during all the summer in the southern part of the Nor- 

 wegian Polar Sea. On the coast of Finmarken it occurred with sporocarps during the 

 months of August, September and October, with tetrasporangia in August. 



Geogr. Distrib. This species has its maximum of frequency in the Norwegian 

 Polar Sea. Lyngbye has reported it from Baffin Bay. It seems uncertain as yet whether 

 it occurs really also at other places in the Arctic Sea. It is certainly considered as 

 native in the Greenland Sea on the coast of Spitzbergen. I have indeed found it here 

 myself, though never attached, but only washed ashore, having probably drifted there 

 from the south. This was possibly the case also with those specimens which were 

 brought home from the same region by Torell's expedition 1861. In the White Sea 

 it has not been noticed at all. For the time being, Gjesvser immediately north of 71° 

 N. Lat. must be regarded as the northernmost place where it has been with certainty 

 found to grow. 



Localities: The Norwegian Polar Sea: Nordlanden, Tromso amt at Tromso, Reno, 

 and KarlsO; Finmarken at Maaso, Gjesvser, Oxfjord, and the southern coast of Magero, 

 everywhere common and plentiful. 



The Greenland Sea : the coast of Spitzbergen (?). 



Baffin Bay: the west coast of Greenland. 



Polysiphonia arctica J. G. Ag. 



Spec. Alg. 2. p. 1034. 

 Descr. Polysiphonia arctica J. G. Ag. 1. c. et Gobi, Algenfl. Weiss. Meer. p. 26. 

 Exsicc. » » Kjellm. in Akesch. Alg. Scand. exsioc. N:o 403. 



Syn. Conferva nigra B,. Br. in Scoresby, Account. 1. App. 5(?) 



Hutchinsia badia Post et Eupr. 111. Alg. p. II. Cfr. Gobi, 1. c. p. 27. 

 » btricta Lindbl. Bot. Not. p. 168. 



