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



nurse-plant. At this season it is richly provided with zoospores. However I thiiik I 

 have found specimens witli 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 



6"/;/. incliisum. 



Fam. PALMELLACEiE (Näg.) Wittr. 



Pl. Scand. p. 19; Näg. Gått. einz. Alg. p. 61; lim. raut. 



Gen. OMorangium Cienk. 



Bericht. p. 23. 



Ch lor angiu m Marinum Cienk. 



1. c. et t. 1, tig. 7—9. 



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



Ser. NOSTOOHINE^ (Ag.) Näg. 



sub. nom. Nostocnceje Algensyst. p. 132; Ag. Syst. Alg. p. XV; lim. raut. 



Fara. RIVULARIACEJi Harv. 



in Engl. Fl. 5, p. 262. 

 Syn. Calot]-iche£e Thuv, Nostoch. p. 10. 



Gen. Rivularia (Roth) Thur. 



Nostocli. p. 5; lioTH, Cat. Bot. 3, p. 332; char. emend. 



Rivularia Hemisphterica (L.) Aresch. 



Alg. Scand. exsicc. Ser. 1, N:o 47. Treraella hemispliferica L. Spec. Pl. 2, p. 1158; seo. Akesch. 

 Phyc. Scand. p. 437. 



Descr. et Fig. Rivulavia atra Harv. Phyc. Brit. t. 239. 

 Exsicc. » heraispliferica Aresch. 1. c. 



iSyii. Rivularia hemisphc"erica Foslie, Aret. Havalg. p. 9. 

 Linkia 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°. 



K. Vet. Akad. Handl. Bd 30. N:o .5, 4 i 



