104 OLAF GALL0E 



around Rey5arfjor<5ur and Sey5isfj6r5ur on the cast coast, the country 

 around Husavik and EyjafjorQur on the north coast, Isafjorftur on the 

 north-western peninsula, Reykjavik and HafnarfjorfHir in South-west 

 Iceland, the districts around Mvvatn, Jokulsa and Laxa 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- 

 ma nnaey jar. 



I had a fairly good opportunity of investigating these districts 

 somewhat thoroughly. But unfortunately, 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 (Gronlund and Helgi 

 .1 o us son). 



As regards the literature on the subject, reference should be made 

 to Dei chman n Branth's "Liehenes Islandia 1 " (Botanisk Tids- 

 skrift, vol. 2.'), l<)0,'i) 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 

 Kndococcus 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 0kologi" (Bot. Tidsskrift, vol. 28, 1 ( .)()8) and "Forberedende 

 Unders0gelser til en almindelig Likenokologi," (Dansk botanisk Ar- 

 kiv, vol. I, no. 3, 1913). In these papers full references will be 



