104 OLAF GALLOE 
around Reydarfjöröur and Seydisfjöröur on the east coast, the country 
around Hüsavik and Eyjafjöröur on the north coast, Isafjöröur on the 
north-western peninsula, Reykjavik and Hafnarfjöröur in South-west 
Iceland, the districts around Myvatn, Jökulsä and Laxä in the in- 
terior of North Iceland proper, and the districts about Thingvellir 
and Geysir. In addition, I paid a flying visit to the islands of Vest- 
mannaeyjar. 
I had a fairly good opportunity of investigating these districts 
somewhat thoroughly. But unfortunalely, on the other hand, I had 
no chance of seeing anything worth mentioning of the desert-interior 
of Iceland. Among other specially interesting localities were the 
numerous sea-fowl cliffs along the coasts: no doubt these would 
prove remarkable in many ways, but I had no opportunity of making 
independent observations in such spots. 
The results of these investigations I have embodied in the fol- 
lowing Lichen Flora (which, by my work, contains a fairly con- 
siderable number of species not found previously,) and Lichen Ve- 
getation of Iceland; this latter subject has been studied only par- 
tially and not at all exhaustively by others (Grönlund and Helgi 
Jönsson). 
As regards the literature on the subject, reference should be made 
to Deichmann Branth’s “Lichenes Islandiæ” (Botanisk Tids- 
skrift, vol. 25, 1903) in which all lichenological literature pertaining 
to Iceland has been enumerated, and a full record of collectors and 
collections from Iceland has been given. It is the newest and most 
exhaustive list of species, but now to it must be added those species 
which have subsequently been found by me. I have been obliged 
to make a few minor alterations in Branth’s list, as the genus 
Endococcus can scarcely be maintained any longer as a lichen-genus, 
and is therefore omitted from the following list. 
A full description of the conditions pertaining to vegetation in 
Iceland, and the references to literature will be found in the part 
of the present work (vol. I) written by Professor Thoroddsen. 
These two aids to the study of the literature are very exhaustive. 
As regards the ecological and other biological conditions, I must 
refer the reader to my two papers mentioned above, “Danske Li- 
keners Økologi” (Bot. Tidsskrift, vol. 28, 1908) and “Forberedende 
Undersøgelser til en almindelig Likenokologi,” (Dansk botanisk Ar- 
kiv, vol. I, no. 3, 1913). In these papers full references will be 
