KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5, 159 
The White Sea: Cp. Gost 1. c p. 12 and 43. 
Baffin Bay: the west coast of Greenland at Neuherrnhut. 
At Nordlanden the species occurs in its typical form, at other places, as far us 
I have been able to ascertain, in a finer and more slender form, which agrees with that 
distributed by Arescnoue 1. c. as F. fustigiata f. tenuior. 
Fam. GIGARTINACE (Kttz.) J. G. Ac. 
Epicr. p. 173; Kurz. Phyc. gener. 389; char. mut. 
Gen. Cystoclonium Ki'rz. 
Phye. gener. p. 404. 
Cystoclonium purpurascens (Hunps.) Kirz. 
]. c. Fucus purpurascens Hups. Fl. Angl. p. 589. 
f. typica. 
Descr. Cystoclonium purpurascens J. G. Ac. Epicr. p. 239. 
Fig. | Hypnea purpurascens Harv. Phyc. Brit. tab. 116. 
» Cystoclonium purpurascens Kurz. Tab. Phyc. 18, tab. 15. 
Exsice. » » ArerscH. Alg. Scand. exsice. N:o 76. 
f. dendroidea nob. 
f. pumila, 7—10 cm. alta, thalli axi primario crassiusculo, inferne subnudo, supra medium decomposito- 
ramoso, ramis fasciculum densum, circumscriptione semicircularem vel sustriangularem formantibus. Polysipho- 
niam elongatam var microdendron habitu revocat. In formam typicam aperte abiens. 
Syn. Cystoclonium purpurascens Gosr, Algenfl. Weiss. Meer. p. 40. 
» » Kieren, Nordl. Alg. p. 18. 
» » ZELLER, Zweite d. Polarf. p. 85. 
Fucus confervoides Wa. Fl. Lapp. p. 504. 
Gigartina purpurascens Nyl. et Sel. Herb. Fenn. p. 74. 
Hypnea purpurascens CroaL, Fl. Dise. p. 459. 
Soliera chordalis Asum. Alg. Hayes p. 64? Cfr. Farr. New Engl. Alg. p. 148. 
Habitat. 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 alge 
or to steep rocks. In the upper part of this zone it is found chiefly 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 shallow rock-pools where Mytilus edulis lives in great numbers. The 
species flourishes beth on exposed coasts and in sheltered places. It has been found 
with tetrasporangia at Nordlanden in summer, with sporocarps in August. 
Geogr. Distrib. 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 
