KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 5 A | 
nurse-plant. At this season it is richly provided with zoospores. However | think I 
have found specimens with zoospores also in summer. 
The present alga has the same geographical distribution as Sarcophyllis arctica. 
In all the localities where I have met with the last-mentioned species, | have also found 
Chl. inelusum. 
Fam. PALMELLACE (NAc.) Wirtr. 
Pl. Scand. p. 19; Nac. Gatt. einz. Alg. p. 61; lim. mut. 
Gen. Chlorangium Cimnk. 
Bericht. p. 23. 
Chlorangium Marinum Crenk. 
lec et te i, fic. “7—9: 
This species is reported from the White Sea by Cienkowsky (Cp. 1. c.). 
Ser. NOSTOCHINEA®: (Ac.) NAc. 
sub. nom. Nostocacee Algensyst. p. 132; Ac. Syst. Alg. p. XV; lim. mut. 
Fam. RIVULARIACEZE Harv. 
in Engl. Fl. 5, p. 262. 
Syn. Calotricheee Thur, Nostoch. p. 10. 
Gen. Rivularia (Rorn) Tuur. 
Nostoch. p. 5; Rovtn, Cat. Bot. 3, p. 332; char. emend. 
Rivularia Hemispherica (L.) AreEscu. 
Alg. Scand. exsice. Ser. 1, N:o 47. Tremella hemispherica L. Spec. Pl. 2, p. 1158; sec. AREscu. 
Phye. Scand. p. 437. 
Deser. et Fig. Rivularia atra Harv. Phyc. Brit. t. 239. 
Exsice. » hemispheerica Argscu. |. c¢. 
Syn. Rivularia hemispherica Fosiir, Arct. Havalg. p. 9. 
Linkia atra Sommerer. Suppl. p. 201. 
Habitat. It grows in the upper part of the litoral zone on sheltered coasts, gre- 
garious, but in small numbers. I have taken specimens with hormogonia in course of 
development at Finmarken in the beginning of September. 
Geogr. Distrib. Known from the north coast of Norway and the west coast of 
Greenland. The most northern point where it has been found is Talvik in Finmarken, 
about Lat. N. 70°. 
K. Vet. Akad. Handl. Bd 20. N:o 5. 
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