On the Marine Algæ from North -East Greenland. 123 



and to the reproduction. Thus, the zoospores seem never to have 

 been observed. The colour was yellow-green in the dried specimens 

 from West Greenland I have examined, and according to Kjellman 

 the colour of the cell-contents is brownish-green (fusco-viride) (1. с 

 p. 51). An examination of specimens from West Greenland and 

 from Spitzbergen (communicated by Kjellman) showed really that 

 the cells contained no starch and that the cell-wall did not consist 

 of cellulose, the walls of the empty sporangia only staining violet 

 by chlor-iodide of zinc. There is thus reason to believe that the 

 alga in question is not a Chlorophycea but a Phæophycea, and as 

 the more elongated plants in the material from East Greenland 

 much resemble Ectocarpus lacifugus Kuck. the plant must be in 

 that case a species of Ectocarpus related to E. lacifugus. On account 

 of the good state of preservation (alcohol) of the material from 

 North-East Greenland it was easy to see that the cells contain a 

 parietal chromatophore like that described by Kuckuck. The plants 

 had unilocular sporangia agreeing W4th those described by me in 

 Pilinia maritima (1893 fig. 43) and with those of Ectocarpus lacifugus 

 (I.e.); they were only a little smaller than the latter, namely 20— 

 24 // long, 9 — 10 /i broad, while the sporangia in Kuckuck's plants 

 were 30 — 35// long and 11—15 /j. broad. 



As the more elongated and the denser plants undoubtedly belong 

 to the same species, and as the denser form fully agrees with Chœ- 

 tophora maritima Kjellm., the species must retain Kjellman's specific 

 name but it must be referred to the genus Ectocarpus. It is beyond 

 doubt that the species is nearly related to E. lucifugus Kuck., and 

 the resemblance is so great that there is reason to ask if these two 

 species might not be identical. There seems however to be at least 

 one distinctive character, some of the branches in E. maritimus ter- 

 minating in hairs or hair-like filaments consisting of narrower and 

 longer cells with scarcer and less coloured contents, as in several 

 species of Ectocarpus, while such hairs are wanting in E. lucifugus 

 according to the express statement of Kuckuck (1. с. p. 35) and to 

 what I found on examining original specimens sent by Prof. Kuckuck. 

 In the plants from North-East Greenland, however, the hairs were 

 only fully developed in the specimens with short and dense branches. 



This species much resembles the fresh-water alga Pleurocladia 

 lacustris A. Br. (comp. Wille (1895) and Klebahn (1895)) and seems 

 to be related to it. In my opinion, the genus Pleurocladia cannot be 

 maintained as distinct from Ectocarpus; the species named must 

 therefore be called Ectocarpus lacustris (A. Br.) nob. 



Loc. Vestre Havnenæs. 

 XLIII. 10 



