62 



Regarding the structure of the chromatophore and the structure 

 of the cell altogether, the Greenlandic specimens fully agree 

 with the Icelandic 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 /г thick, 

 and the plants were less abundant. 



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



Gr. or.: Tiningnekelak. 



Geogr. distribution: Iceland, The Færoes, Norway. 



100. U. siibflaccida Wille Studien p. 27. 



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

 sterile specimens. They fuUy'agree with Wille'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// thick. The plants were found together with Fercursaria 

 percursa, Acrosiphonia sp. and ürospora mirabilis. 



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

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

 TJ. implexa Kütz. 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 Kut 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. 



Monostroma (Thur.). 



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

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



