On the Marine Algæ from North-East Greenland. 125 



Fam. Sphacelariaceœ. 

 Chætopteris Kütz. 



44. Ch. plumosa (Lyngb.) Kütz. 



к. Rosenvinge (1893) p. 903, (1908 I) p. 99; Jonsson (1904) p. 40. 



Only a few badly developed and sterile specimens were met with. 



Loc. Danmarks Havn; bay ofT Vesterdalen; Cape Amélie, in clumps in 

 the ice, April. 



Spliacelaria Lyngb. 



45. S. racemosa Grev. var. arctica (Harv.) Reinke. 



к. Rosenvinge (1893) p. 904, (1898 I) p. 100; Jonsson (1904) p. 40. 



A couple of well-developed but sterile specimens have been 



found at Cape Bismarck Peninsula. Specimens found in the harbour 



in August had young unilocular sporangia sitting solitary on short 



1 — 3-celled stalks, which were as a rule monosiphonous, more rarely 



two in one stalk, 



Loc. East Side of Ivoldewey Island; alont^ Cape Bismarck Peninsula; 

 Danmarks Havn, very scarce. 



G. Chlorophyceæ. 



Fam. Phyllosiplionaceœ. 



Ostreobium Born, et Flah. 



46. O. Queketti Born, et Flah. 



K. Rosenvinge (1893) p. 906, (1898 I) p. 101. 



Occurs frequently in old shells of various bivalves {Mya, Saxi- 

 cava), but also met with in Lithothanmion foecundum. It is well- 

 developed and has often the characteristic swellings described by 

 Bornet and Flahault. These swellings often reach considerable 

 dimensions and are then filled with a granular green matter, but I 

 cannot state anything about their significance. The colour is always 

 green. Transverse walls do not occur. 



Loc. East Side of Koldewey Island; entrance to the harJjour; along 

 Vestre Ilavnenæs, 19—47 meters; off Baadskærct 38 meters. 



Fam. Cladoplîoraceœ. 

 Acrosiphonia (J. Ag.) Kjellm. 



47. A. hystrix (Strönif.) Jonss. 



Jonsson (1904) p. 4G. 



Spongomorpha hijstiix Strömfeit (1886) p. 34. 



Cladoplwra arcta y, hyslrix K. Kosenv. (1893) p. 907. 



10* 



