122 L. KoLDERUP Rosenvinge. 



Leptoueiiia Reinke. 



37. L. fasciculatum Reinke. 



K. Rosenvinge (1893) p. 879; Jonsson (1904) p. 35. 



Elachista fasciciilata (Reinke) Gran, K. Rosenvinge (1898 I) p. 35. 



Attached to Lithothamnion glaciale, mostly f. subcylindrica К. 



Roseiiv., some filaments f. iincinala Reinke. 



Lo c. Entrance to the hartjour. 



Fam. Ectocarpaceæ. 



Eetocarpus Lyngb. 



38. E. (Pylaiella) littoralis (L.) Lyngb. 



K. Rosenvinge (l.S93l p. 881. (1898 I) p. 75; Jon.sson (19U4) p. 35. 



Found in various localities, mostly loose and in company with 

 other loose algæ, in particular Stichjosiphon tortilis. Also found 

 attached to stipes of Alaria. The latter specimens were very bran- 

 ched with secund branches, the others had often opposite branches. 

 Unilocular sporangia were met with in plants collected in July and 

 August. 



Loc. East Side of Ivoldewey Island; along Cape Bismarck Peninsula; 

 Danmarks Havn; bay off Vesterdalen, at most 4 meters; Cape Amelie, in 

 clumps in the ice. 



39. E. ovatus Kjell m . var. tenuis К. Rosen v. 



к. Rosenvinge (1898 I) p. 77; Jonsson (1904) p. 37. 



Small ca. 1 mm. high plants were found epiphytic on Tiirnerella 

 Pennyi and Lithothamnion glaciale. They bear plurilocular sporangia 

 which are mostly alternate or secund; opposite sporangia however 

 also occur. The upright filaments are often unbranched (comp. 

 Jonsson 1. с). 



Loc. Danmarks Havn, and tlie entrance to the liarbour. 



4Ü. E. maritimus (Kjellm.) K. Rosenv. comb. nov. 



Chcetophora maritima I\jellman (1877) p. 51, pi. У fig. 15 — 16. 

 Pilinia maritima (Kjellm.) K. Rosenv. (1893) p. 932. 



In company with Calothrix scopulorum and other littoral algæ 



a small, branched filamentous alga was met with, occurring partly 



in a rather elongated partly in a shorter and denser form. The 



latter agrees pretty well with Chœtophora maritima Kjellm., which 



has been referred by me to the genus Pilinia. On the other hand 



the more elongated plants remind one so much of Eetocarpus Inci- 



fugus Kuckuck, which has been so carefully described by its author 



(Kuckuck 1897, p. 35, pi. XI— XII), that the question arises whether 



it has been legitimate to refer this plant to the Chlorophyceæ. It 



is in reality very imperfectly known in regard to the cell-contents 



