KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 159 



The w/lite Sea: Cp. GoBi 1. c. p. 12 and 43. 



Baffin Bay: tlie west coast of Greenland at Neuherrnhut. 



At Nordlanden the species occurs in its typical form, at other places, as far as 

 I have been able to ascertain, in a tiner and more slender forin, which agrees with that 

 distributed by Aresghoug 1. c. as F. fastigiata f. tenuior. 



Fam. GIGARTINACE^. (Kutz.) J. G. Ag. 



Epicr. p. 173: Kurz. Pliyc. gener. 389; char. mut. 



Gen. Cystoclonium Kutz. 



Pliyc. gener. p. 404. 



Cystoclonium purpurascens (Huds.) Kutz. 

 ]. c. Fucus purpurascens Hdds. Fl. Angl. p. 589. 



f. typica. 

 Descr. Cystoclonium purpurascens J. G. Aa. Epicr. p. 239. 

 Fig. Hypnea purpurascens Harv. Pliyc. Brit. falj. 116. 



»' Cystoclonium purpurascens KiiTZ. Tab. Phyc. 18, tab. 15. 



Exsicc. » » Aresch. Alg. Scand. exsicc. N-.o 76. 



f. dendroidea nob. 



f. pumila, 7 — 10 cm. älta, tlialli axi primario crassiusculo, iuferne subnudo, supra medium decomposito- 

 raraoso, ramis fnscicuUim densum, circumscriptione semicircularem vel sustriangularem formantibus. Polysiplio- 

 niam elongatam var raicrodendron habitu revooat. In formara typicam aperte abiens. 

 Syn. Cystoclonium purpuvascens GoBi, Algenfl. Weiss. Meer. p. 40. 

 « » Kleen, Nordl. Alg. p. 18. 



» » Zellek, Zweite d. Polarf. p. 85. 



Fucus confervoides Wg. Fl. Lapp. p. 504. 

 Gigartina purpurascens Nyl. et Sael. Herb. Fenu. p. 74. 

 Hypnea purpurascens Ceoall, Fl. Disc. p. 459. 

 Soliera cliordalis Ashm. Alg. Hayes p. 64? Cfr. Farl. New Engl. Alg. p. 148. 



Hnbitat. I know nothing about the habitat of the present species within the 

 arctic region of the Polar Sea. In the Norwegian Polar Sea it is litoral. The typical 

 form lives usually within the lowest part of the litoral zone, attached to other algae 

 or to steep rocks. In the upper part of this zone it is found chiefiy in deep rock- 

 pools between tide-marks. The form dendroidea I have met with only in the upper 

 part of the litoral zone. It assumes here its most peculiar appearance, when growing 

 on the walls of shalloAv rock-pools where Mytilus edidis lives in great numbers. The 

 species flourishes both on exposed coasts and in sheltered places. It has been found 

 M'ith tetrasporangia at Nordlanden in summer, with sporocarps in August. 



Geogr. Distrih. This species occurs in both divisions of the Polar Sea, but it is 

 scarce in the arctic. It reaches its maximum of frequency in the southern part of the 



