Bd. IV: 12) THE VEGETATION IN SOUTH GEORGIA. 31 



looks different. This part of the mountain is shown on PI. 2. The tussock forms 

 irregular tongues and patches; their upper limit declines as we advance up the 

 valley, and finally they cease altogether. There is much loose material — avoided 

 by the grass — on the slope, and falls of rock occur at intervals. Various vascular 

 plants reach a height of at least 250 m, but even at a height of 50 — 100 m they are 

 seen in scattered specimens, or forming small patches, but not a close cover; here 

 and there a tuft of Festuca erecta, a Phleum alpinum, an Aira antarctica or Poly- 

 stichum mohrioides var. plicatum, or even a small colony of Acaena, mostly A. te- 

 nera, as usual accompanied by Tortula robusta. 



From 100 — 120 m the Andreaea-tundra puts its stamp on the slope, growing 

 in smaller or larger communities according to the ground; the genus next in im- 

 portance to Andreaea is Rhacomitrium. 



Andreaea parallela Rhacomitrium austrogeorgicum 

 » pumila » heterostichoides 



s Willii » pachydictyon 



Bartramia pycnocolea Tortula pycnophylla 



Dicranozveisia subinclinata 



Psilopihnn antarcticum Cliiloscyplms k'oppensis f. 



Lophocolea azopardana. 



On the ridge, which is very much exposed to the wind, there is a moss- and 

 lichen-tundra. The higher plants are scarce. In crevices and on the narrow shelves 

 towards the sea, I noted at a height of 230 — 250 m: Acaena adscendens and tenera, 

 Colobantluis subulatus, Galium antarcticum, Hymenophyllum falklandicutn and 

 Polystichum mohrioides var. plicatum; there were also some 2 — 3 dm high plants 

 of Poa flabellata and small patches of Festuca erecta with Phleum alpinum. 



Andreaea pumila 

 Conostomum australe 

 Dicranoweisia subinclinata 

 Dit rich u m hya linoc usp id a turn 

 Grimmia Nordenskjôldii 



Amongst the mosses: 

 Cladonia subsquamosa 



On the rocks: 

 Placodium elegans 



Pogonatum alpinum v. austrogeorgi- 

 cum 

 Rhacomitrium austrogeorgicum 



Lophozia propagulifera. 



Stereocaulon alpinum. 



Neuropogon melaxanthum 



Rhizocarpon geographuuin. 



