KONGL. SV. VET. AKADKMIENS HANDLINGAK. BAND 20. N:0 5. 299 



Localities: The Norwegian Polar Sea: Nordlanden: Troinso amt at the town of" 

 TromsO; Finmarken at Hammerfest. 



The White Sea: at Solowetzki Isles. 



Baffin Bay: the west coast of Greenland at Julianeshaab. 



Monostroma arcticum Wittk. 



Monostr. p. 44. 

 Descr. Monostroma arcticum Wittr. 1. c. 

 Fig. » » » t. 2, fig. 8. 



Ecesicc. I) » Kjellm. in Wittr. et Nordst. Alg. exsicc. N:o 144. 



Syn. Monostroma arcticum Kleen, Nordl. Alg. p. 41. (?) 



Addition to the description. This species agrees in development with the four pre- 

 ceding ones. The frond when very young forms an almost spherical, pear-shaped, or 

 cylindrical bladder, which bursts and is split down to the base. Afterwards the frond 

 expands and becomes laciniate. When fully developed it has a brownish colour. 



Habitat. A litoral species attached to Balani or litoral algaj, as Ehodomela lycopo- 

 dioides, Halosaccion, Gigartina, Rhodymenia, and old stems of Fuci. It prefers open coasts, 

 occurring at places exposed to the unbroken violence of the sea, often gregarious in 

 considerable numbers. Specimens with zoospores were common on the coast of Fin- 

 marken at the end of August. 



Geogr. Distrib. Known from the north coast of Norway. It is plentiful at Fin- 

 marken. The most northern point where it has been collected is Gjesvaer about Lat. N. 71°. 



Localities: The Norwegian Polar Sea: Nordlanden at BodO (?). (Cp. at M. latissi- 

 mum;) Finmarken: Maas5 and Gjesvaer abundant. 



Monostroma leptodermura Kjellm. 



Algenr. Murm. Meer. p. 52. 

 Descr. et Fig. Monostroma leptodermum Kjellm. 1. c. et t. 1, p. 23 — 24. 



Habitat. Found only once, washed ashore. Known only as sterile. 

 Locality: The Murman Sea: Matotshin Shar at Novaya Zemlya. 



Monostroma fuscum (Post, et Rupe.) Wittr. 

 Monostr. p. 53. Ulva fusca Post, et Eupk. 111. Alg. p. 21. 

 Descr. Monostroma fuscum Wittr. 1. c. 

 Fig. » » » t. 4, fig. 13. 



Exsicc. Ulva sordida Aresch. Alg. Scand. exsicc. N:o 120. 



Monostroma fuscum Kjellm. in Wittr. et Nordst. Alg. exsicc. N:o 143. 

 Syn. Monostroma fuscum Gobi, Algenfl. Weiss. Meer. p. 79. 



» » Kjellm. Spetsb. Thall. 2, p. 49; Algenv. Hurra. Meer. p. 52. 



» » Kleen, Nordl. Alg. p. 41. 



» » Wittr. 1. c. 



Ulva sordida Aresch. Phyc. Scand. p. 413. 



