KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 2Q. N:0 5. 299 
Localities: The Norwegian Polar Sea: Nordlanden: Tromsé amt at the town of 
Tromsé; Finmarken at Hammerfest. 
The White Sea: at Solowetzki Isles. 
Baffin Bay: the west coast of Greenland at Julianeshaab. 
Monostroma arcticum WITtTR. 
Monostr. p. 44. 
Descr. Monostroma arcticum Wirvrr. |. ce. 
Fig. » » » en oe fig. 8. 
Exsice. » » Kyeutm. in Wirrr. et Norpst. Alg. exsice. N:o 144. 
Syn. Monostroma arcticum Kieren, 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 alge, as Rhodoimela lycopo- 
dioides, Halosaccion, Gigartina, Rhodymenia, and old stems of Fuct. 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 Gjesver about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden at Bodo (?). (Cp. at W. latissi- 
mum;) Finmarken: Maasé and Gjesver abundant. 
Monostroma leptodermum KJELuM. 
Algenv. Murm. Meer. p. 52. 
Descr. et Fig. Monostroma leptodermum Kyetwum. |. 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 Rupr.) Wrrrr. 
Monostr. p. 53. Ulva fusca Post. et Rupr. Ill. Alg. p. 21. 
Descr. Monostroma fuscum Wrrrr. 1. c. 
Fig. » » » t. 4, fig. 13. 
Exsicc. Ulva sordida Arescu. Alg. Scand. exsicc. N:o 120. 
Monostroma fuscum KseLLM. in Wrirrr. et Norpsr. Alg. exsice. N:o 143. 
Syn. Monostroma fuscum Goi, Algenfl. Weiss. Meer. p. 79. 
» » KJELLM. Spetsb. Thall. 2, p. 49; Algenv. Murm. Meer. p. 52. 
» »  Kueen, Nordl. Alg. p. 41. 
» » Wirrr. |. ec. 
Ulva sordida Argscu. Phye. Scand. p. 413. 
