62 



Regarding the structure of the chromatophore and the structure 

 of the cell altogether, the Greenlandic specimens fully agree 

 with the [celandic plants. With gametes in July. 



The specimens from East Greenland occurred on Rhody- 

 menia palmata, they essentially resemble the above mentioned 

 plants from West Greenland. The filaments are 14 — 16 /i thick, 

 and the plants were less abundant. 



Gr. occ: Kornok (L. K. R.). 



Gr. or.: Tiningnekelak. 



Geogr. distribution: Iceland, The Færoes, Norway. 



100. I', subllaccida Wille Studien p. 27. 



To this species I have only referred some few, young, and 

 sterile specimens. They fully agree with Wi lie's description 

 and are easily recognizable by the position of the pyrenoid. 

 The chromatophore does not fill the length of the cell and 

 frequently occurs with a lobed margin. The filaments are 7 

 — 16;i thick. The plants were found together with Percurmria 

 jjerctirsa, Acrosiphonia sp. and Urospora mirabilis. 



Hazen (Am. Ulothricaceæ p. 155) remarks, that U. subflac- 

 cida Wille apparently is identic with U. implexa Kütz. Whether 

 TJ. implexa Riitz. is identic with any of the new species of 

 Ulothrix described by Wille (I.e.) or not, must be left unde- 

 cided until further examination of Kiit zing's original specimens 

 has taken place, but judging from the description and figures 

 (Hazen I.e. PI. 21, fig. 1,2) the American U. implexa does not 

 seem to be identic with U. subflaccida (cfr. above p. 57). 



Gr. occ: Julianehaab (N. H.). 



G r. r. : Smalsund. 



Geogr. distribution: Iceland, Norway. 



Fam. Ulvaceœ. 



Mouostroma (Thur.). 



101. M. fuscum (Post, et Rupr.) Wittr., emend. K. Rosenv. 

 Grl. Havalg. p. 940, Deux. Mém. p. 116. 



