319 



in Iceland only in the surroundings of hot springs, thus at 

 Laugarne near Reykjavik in water of a temperature of ca. 25° 

 (Gronlund 1890 p. 140, Ostenfeld 1899 p. 238, Stefansson 1901 

 p. 117); the ubiquitous C. venia not with certainty on the 

 Færoes. In Greenland C. venia was found as far up the moun- 

 tains as ca. 166 m. above the sea, in Scoresby Sund ca. 70°15' 

 N. L., East Greenland (Hartz 1895 p. 323). Hegelmaier notes 

 it from the Morteratsch glacier, Engadin (1. c). 



С pobjmorpha Lönnr. is mentioned from Greenland, but 

 as far as I am able to judge, this species consists of forms of 

 other species, viz. of С venia and С. hamulata. 



С. autumnalis, gathered only a few times, has a low growth, 

 especially the species from Disco, West Greenland, ca. 70° N. L., 

 found by M. P. PoRsiLD in a depth of 0,16 — 0,33 m, but those 

 from Iceland too; from the Færoes there is but little material 

 of this species, it is only available in herbarium-specimens, 

 and for that reason not examined anatomically. 



Some peculiar plants gathered by Professor Warming July 6, 

 1885, in the river Alten, Finmark, appear to be С longistijla 

 Norman (1895 p. 281), who has noted it only from one locality, 

 near to the same river at Raipas about 69°57 N. L. 



Callitriche is found in still as well as in running water, 

 С verna also in dried-up places (e. g. Norman 1. с p. 280), 

 which seems to be comparatively often the case in Greenland. 



C. autumnalis in lakes at Disco, ca. 70° N. L. (Porsild 1902 

 p. 206), was growing in patches together with Batrachium 

 paucistamineum and aquatic mosses, in shallow water as men- 

 tioned above. On the Færoes С. hamulata occurs mostly as 

 landform, but also grows in the Litorella-associaVion in lakes, 

 and in streams (Ostenfeld 1901 p. 57, 1908 p. 140—142). 



The bottom in which seedlings of C. venia were observed 

 in a lake on Danmarks Island (70°27' N. L., East Greenland, 

 Hartz 1895 p. 278) consisted of gytje. It was sandy and muddy 

 in a pond with about 35 cm water, in which С hamulata Ktz. 



21* 



