KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 20. N:0 5. 321 



liurse-plant. At this season it is richly provided with zoospores. However I 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, I have also found 

 Chi. inchisum. 



Fam. PALMELLACE^ (Nag.) Wittr. 



PI. Scand. p. 19; Nag. Gatt. einz. Alg. p. 61; lim. mut. 



Gen. Ohlorangium Cienk. 



Bericht. p. 23. 



Chlorangium Marinum Cienk. 

 1. c. et t. 1, %. 7—9. 



This species is reported from the White Sea by CienkoAvsky (Cp. 1. c). 



Ser. NOSTOOHINE^ (Ag.) Nag. 

 sub. nom. Nostocaoefe Algensyst. p. 132; Ag. Syst. Alg. p. XV; lim. mut. 



Earn. RIVULARIACE^ Harv. 



in Engl. m. 5, p. 262. 

 Syn. Calotrichese Thuv. Nostoob. p. 10. 



Gen. Rivularia (Roth) Thur. 



Nostoch. p. 5; Roth, Cat, Bot. 3, p. 332; cliar. emend. 



Rivularia Hemisphaerica (L.) Aresch. 



Alg. Scand. exsicc. Ser. 1, N:o 47. Tiemella lieraispliferioa L. Spec. PI. 2, p. 1158; sec. Aresch. 

 Phyc. Scand. p. 437. 



Descr. et Fig. Rivularia atra Hakv. Phyc. Brit. t. 239. 

 Exsicc. » hemispliserica Aresch. 1. c. 



Syn. Rivularia hemisphserica Foslie, Arct. Havalg. p. 9. 

 Liukia atra Sommerf. 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°. 



41 



K. Vet: Akad. Handl. Bd 20. N:o 5. 



