67 



salsa Kjellm. (The algæ of the arctic sea p. 292, pi. 31, fig. 1—3) 

 hut still they differ from it in many respects, while they seem to 

 be identic with E. micrococca f. suhsalsa Borgesen (Freshwater 

 Algae 1. c). The Greenlandic specimens differ from E, *micro- 

 cocca on account of the anatomical characters in spite of their 

 small cells. The cells are frequently arranged in longitudinal 

 series ; seen from above they are usually of angular shape and 

 only rarely somewhat rounded, they are of different size, and 

 sometimes about twice as broad as long. In transverse section 

 the frond also differs from E. *micrococca as to the shape of 

 the cells and the thickness of the walls, but agrees essentially 

 with E. proliféra. Such specimens in many respects resemble 

 E. arctica J. Ag. and probably might be regarded as a very 

 proliferous form of that species ; as E. arctica has before been 

 included in E. proliféra (Rosenv. 1. c.) such extreme forms of 

 the latter with the small cells might be called f. arctica (J. Ag.) 

 (cfr. Collins, Ulvaceae 1. c. p. 22). 



The specimens occurred in company with Fercursaria 

 percursa on somewhat overflowed shore. Gathered in July. 



Gr. or.: Dunholm. 



Percursaria Bory. 



107. P. percursa (Ag.) K. Rosenv. Gr. Havalg. p. 963. 



It has been collected in a single place on the eastern 

 coast of Greenland together with Enteromorpha proliféra. The 

 filaments consist of two rows of cells. It was collected with 

 zoospores in July. 



Specimens collected by Rosenvinge June 5, 1888 at 

 Igdlorsuit in West Greenland are furnished with rhizoids. The 

 rhizoids often occur abundantly, they usually consist of a single 

 cell, sometimes of more than one and occasionally they seem 

 to be transformed into branches. The specimens essentially 

 resemble the branched Icelandic plants (Jonsson Icel. Alg. p.343, 



6* 



