574 



A. HESSELBO 



feriim, Hypmim imponens, Miiiuni horniim, M. iindiilatiim, M. serra- 

 tum, Fissidens osmiindoides and Enthostodon ericetorum. On a stone 

 partly inundated b}" the hot water, which had a temperature of 

 about 50°, Fissidens osmundoides, Blindia acuta, Dicranella sqaar- 

 rosa, Enthostodon ericetorum, Anthoceros punctatus, Aneura multifida 

 and Scapania irrigua grew intermixed. 



Fig. 23. Deildati'inguhver. To the left is the slope wilh tlie hot springs. The part 



in the middle is saturated witli the Iiot walcr and covered with Sphagnum papillo- 



siim. Pahjtrichiun coininunc and Hudrocotijle. 



Deildatungu h ver (Gronlund's Tiinguhver) (Fig. 23) is 

 situated north of the river and opposite to Kleppjarnsreykir. It is 

 mentioned bj^ Gronlund (1877, p. 349), who states that the surface 

 temperature of the ground at the top of the hill was 23° R, and 

 that there Polyirichum commune, Sphagnum cymbifolium, S. cuspida- 

 tum and a Campijlopus (C. flexuosus) — not determined with cer- 

 taintj^ — grew in the warm ground. Deildatunguhver is one of 

 the hot springs of Iceland which discharge the greatest amount 

 of water, and consists of a row of holes at the foot of a hill 

 6 — 8 metres high, whence an enormous quantity of water and 

 steam is ejected with a great noise. The masses of steam, 

 which can be seen for miles, enshroud the surroundings of the 

 spring with so dense a cloud that it is hardly possible to ap- 

 proach without getting soaked through. Below the hill the water 



