— 364 — 



My specimens occurred in the upper part of the litoral region, on 

 stones, in company with U. mirabilis a. o. 



E. I c el. Borgarnes. 

 SW. I cel. Reykjavik. 

 S. I cel. Vestmannaeyjar. 



Irospora Wormskioldii (Mert.) Rosenv. Grl. Havalg. p. 920, fig. 36. 



The Icelandic plants are up to 40 cm. long, and 500 p thick in the 

 upper part of the filaments, and the thicknes of the lowest part of the 

 filament is about 30—4-0 fx. My plants agree precisely with the descrip- 

 tion and figures given by Rosen vinge (1. c). It occurs in the middle part 

 of the litoral region and at low-water mark. I have moreover found it 

 growing on the stems of Laminaria in a depth of 1 fathom. The speci- 

 mens gathered by Lundbeck in a depth of 9 fathoms have undoubtedly 

 been removed from the coast by the currents. Fructiferous specimens 

 have been gathered in March— June. 



E. Icel. Skâlanes, Brimnes, Borgarnes. 

 N. Icel. Arnarnes (O. D.). 

 NW. Icel. Aöalvi'k (Ldbk.). 



SW. Icel. Hvalfjöröur (Hjalmar Jensen) ; Reykjavik. 

 S. Icel. Vestmannaeyjar. 



Chætomorpha tortuosa (Dillw.) Kleen, Rosenv. Grl. Havalg. p. 917. 



This species occurs in the upper litoral region and I have only met 

 with it lying loose, either floating in the water of tide pools in large en- 

 tangled masses or between Fucaceæ in the fucus-zone. My specimens are 

 32 — 87 fi thick and agree well with the Greenlandic plants (Rosenv. h c). 

 Probably common round Iceland. 



E. Icel. Vattarnes, Seyöisfjöröur. 



N. Icel. Grjötnes (CO.); Eyjafjöröur. 



NW. Icel. Skålholtsvi'k; Kollafjaröarnes (G. Guömundsson). 



SW. Icel. common. 



Chætomorpha Melagonium (Web. et Mohr) Kütz., Rosenv. Grl. Havalg. 

 p. 917; Strömf. Algveg. p. 55. 



The Icelandic specimens are 6 — 48 cm. high, and occur in tide pools 

 in the litoral region. Most of them agree well with the f. rupincola 

 Aresch., and only some few specimens in Strömfelt's collection, gathered 

 at Eskifjöröur in a depth of 2 — 5 fathoms, are determined by him as 

 f. typica (cfr. also Strömf. Algveg. 1. c). Fructiferous specimens have 

 been gathered in July. 



E. Icel. common. 



N. Icel. Grimsey (O. D.) ; Grjötnes (CO.); Eyjafjöröur. 



