List of Fresliwater Algæ. 75 



Found together with the above-mentioned species under similar 

 conditions. 



L I) c. Lille Snenæs, Thermometer I'jeld. 



3. G. Magma (Bréb.) Kütz., Tab. Phycol. I, tab. 22, fig. 1. 



Børgesen, Ferskvandsalg. Østgrønland, p. 6. 



Found among other Algæ {Nostoc etc.) and Musci near the foot 

 of a glacier and in blackish incrustations on stones. 

 Loc. Lille Snenæs, Thermometerfjeld. 



Coelosphaerium Näg. 



1. С. lacustre (Chodal) Ostenf., Beitr. z. Kenntnis d. Algenfiora 

 des Kossogol-Beckens (Hedwigia, Bd. 46. p. 396, tab. IX, fig. 6 — 7). 



The pear-shaped cells in the colony were somewhat closer 

 together than in the figure of Ostenfeld. 



Lat. cell. = 2,5 /^. 



Dr. Ostenfeld has most kindly seen the plant in question and 

 told me that it seems to him identical with this species. 



Found in a collection from Vester Elv. 



Loc. Danmarks Havn. 



Merismopediiim Meyen. 

 1. M. glaucum (Ehrb.) Näg., Gattung, einz. Algen, p. 55. 



Børgesen, Ferskvandsalg. Østgrønland, p. 7 (Hekla Havn). 



A few specimens were found in collections from Vester Elv. 

 Loc. Danmarks Havn. 



Oscillariaceæ. 



Phorniidium Kütz. 



1. Ph. autumnale (Ag.) Gom., Monograph. Oscill. p. 207, lab. V, 

 fig. 23-24. 



Børgesen, Ferskvandsalg. Østgronl., p. 7 (Hekla Havn . 



Found as blackish crusts among other algæ and mosses on wet 

 earth near a glacier. 



Loc. Thermometerfjeld. 



Rivulariaceæ.. 



Calothrix Ag. 



C. parietina (Näg.) Thur., Bornet et Flahault, Revision des 

 Nostoc. héter. I, p. 366. 



Found together with Gloeocapsa-species as blackish crusts on 

 stones from the bottom of a dry mountain lake. 



