On the Marine Algæ from North-East Greenland. 125 



Fam. Sphacelarlaceœ. 

 Chætopteris Kütz. 



44. Ch. plumosa (Lyngb.) Kütz. 



K. 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 ort' Vesterdalen; Cape Amelie, in clumps in 

 the ice, April. 



Spliacelaria Lyngb. 



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



K. Rosenvinge (1893) p. 904, (1898 I) p. 100; Jùnsson (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 Koidewey Island; along Cape Bismarck Peninsula; 

 Danmarks Havn, very scarce. 



C. Chlorophyceæ. 



Fam. Pliyllosiphonaceœ. 

 Ostreobmm Born, et Flab. 



46. O. Queketti Born, et Flah. 



K. Rosenvinge (1893) p. 906, (1898 1) p. 101. 



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

 cava), but also met with iu Lithothamnion foecundum. It is well- 

 developed and has often the characteristic swellings described by 

 Hornet and Flahault. These swellings often reach considerable 

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

 cannot stale anything about their significance. The colour is always 

 green. Transverse walls do not occur. 



Loc. East Side of Koidewey Island; entrance to the harbour; along 

 Vestre Havncnæs, 19—47 meters; olf Baadskæret 38 meters. 



Fam. Cladophoracecv. 

 Acrosiphonia (J. Ag.) Kjellm. 



47. A. hystrix (^Slromf.) Jonss. 



Jonsson (1904) p. 46. 



Spongomorpha hijstrix Strömfeit (1886) p. 54. 



Cladupliura arcla y, hyslrix K. Uosenv. (1893) p. 907. 



10* 



