238 



As the spores were not ripe and the material, moreover, had becn 

 dried, I am not quite sure as to the correctncss of tlie determination. 

 It occurred as a green covering on turfy soil near Trangisvaag (Syd.). 



227. M. viridis (Kiitz.) Wittr. 



De Bary Conj. tab. 2, fig. 17 — 18. 



Lat. cell. = 7 ;w; lat. sp. = 22 /«. 



Found in a gathering from aheightof 200 m. near Trangisvaag (Sy d.). 



In Hydrophyt. p. 170 Lyngbye mentions Zijgnema genuflexum 

 as occurring »item in rivulis Færoensibus «. Wille (l.c. p.3()) thinks 

 that it must be Mongeotia genuflexum (Dillw.) Ag.; but tbis cannot 

 be fully proved as tbe material in Lyngbye's Herbarium is sterile; 

 the thickness of the filament is 35 — 40 /<, so that agrees fairly well. 



The Conferva alpina mentioned by Lyngbye (Hydrophyt. p. 139), 

 according to the only specimen from Kirkebofjæld found in Lyng- 

 bye's Herbarium, is a mixture of several algæ, e. g. Zygnema, Con- 

 ferva, Stigonema mamillosum, but mostly of a sterile Mougeotia the 

 cells of which are about 18 fi thick. 



Order XL VOLVOCACEÆ. 



228. Gonium pectorale Miill. 



Miss E. Hallas has very kindly told me that she saw a solitary 

 specimen in a collection of Ocdogoninm from »Gjov« near Tværaa (Syd). 



228. Pandorina Morum (Miill.) Bory. 



In a gathering of algæ from Grothusvatn (Sando); and in Plankton 

 from Sorvaagsvatn (Vaago) and the lake near Ejde (Ost.). 



230. Eudorina elegans Ehrenb. 



In Plankton from the lake near Ejde (Ost). 



Order XH. TETRASPORACEÆ. 



231. Apiocystis Brauniana Niigl. 



In a gathering from the lake in Kvalbo Ejde (Syd.). 



232. Tetraspora lacustris Lemm. 



Found in Plankton from Sorvaagsvatn (Vaago). The determination 

 is due to Mr. Lemmermann. 



The Palmella Injalina mentioned by Lyngbye (Hydrophyt. p. 204, 

 tab. 69) is probably, judging from a specimen in his herbarium 

 which is however very shrunken, a Tetraspora. According to Lyng- 

 bye's description we might suppé)se it to be T. cijliiidrica, but both 



