64 OTTO VERNON DARBISHIRE, (Schwed. Südpolar-Exp. 
Before saying a few more words on the connection of the antarctic and sub- 
antarctic American Lichens I would like to give some details regarding the South 
Georgian species. 
Frutic. Foliac. Crust. Totals. 
Subantarctic American and New Zealand species . .... 3 3 3 9 
Subantarctic American species only. ».». 2. 2.2. ...04 p} 5 11 
New, Zealand. species Only... a 002 a re —_ I I 
Olther&countries 2 er: a — 5 5 
14 VITA EN Se ER en 3 10 13 
Subantarctic American and Antarctic . EEE ART _ 2 3 
New.iZealandrand Antarctieri.n SR IE z 1 3 
Antarchieh onTygaL SEE 1 I 2 
Subantarctic American, New Zealand and Antarctic ... 5 1 2 8 
Total 13 12 30 55 
These columns become rather clearer if we put them in this shape: 
Species found also in Frutic. Foliac. Crust. Totals. 
subantarctic America . . . 13 or IOoo % 6 or 50 % 12 or 40 % 31 or 56% 
Newtzealande nee. 2 =:803 86043 6 > so > 72322373 21° >77003 
ARHATCHSP N ER DAN VE 0ER 4303303 6 » 20 > 16 > 30 >» 
other countries. . . ».. - == —— sua7 sp 
Endemicäspecies 7%... =-_ 3 0725 % 10.732033 > 13) 2724» 
It is clear from these few figures that the lichens of South Georgia as far as 
they are known at present are very near to the subantarctic species, nearer in fact 
then to the New Zealand or the Antarctic species. These statistical notes offer in 
my opinion a very strong confirmation of the plea for the separation of the South 
Georgian group of Islands from the true antarctic vegetation area and its inclusion 
in a South Georgian district belonging to the Subantarctic zone of vegetation. This 
is the plan favoured by SKOTTSBERG in his remarks on the distribution of vegetation 
in the colder south hemisphere. 
South Georgia then becomes a half-way house on the road from subantarctic 
America to the true Antarctie district. 
There is apparently no limit to the adverse conditions of cold and exposure 
which the lichens can bare. But it is of course necessary that they should remain 
without snow for at least some time. We have not yet properly learnt what it is in 
the lichen that makes it able to withstand cold as it does. I can only suggest some 
very interesting experiments which could be carried out with no great diffhiculty on 
lichens in the very coldest regions. It would be of the greatest importance to de- 
termine the amount of water contained in the lichen thallus at various times and 
