PREFACE 



The material on which the present paper is based, was like the 

 salt-water material , entrusted to me for examination by the 

 Botanical Museum, Copenhagen University. It comprises in all 572 

 samples, and has been collected by: cand. mag. J. Boye Petersen (B. P.), 

 cand. O. Davidsson (O. D. t), Professor A. Feddersen (A. F. f), Professor 

 Chr. Grønlund (Grld.f), Professor Th. Holm (Ho.), cand. mag. Hjalmar 

 Jensen (Hj. Js.), Dr. phil. Helgi Jonsson (H. Js.), Professor Dr. phil. 

 L. Kolderup Bosenvinge (K. Bsv.), Dr. phil. C. H. Ostenfeld (C. H. O.), 

 Professor Dr. phil. K. Børdam (Bd.), Professor Jap. Steenstrup (Stp.f), 

 Skoleforstander St. Stefånsson (St.), Adjunkt B. Sæmundsson (B. S.), 

 Professor Dr. phil. Th. Thoroddsen (Th.), Dr. phil. C. Wesenberg-Lund 

 (W. L.), Professor Dr. phil. E. Warming*). 



Special thanks are due to Prof. Dr. phil. Th. Thoroddsen for 

 his valuable assistance in revising and correcting the names of 

 the Icelandic localities. As to the indication of the parts of the 

 country, these have been copied from the labels, where the localities 

 as a rule have been plainly marked. In this way the samples are 

 apportioned as follows: 



South, given in the text as S 127 samples 



South-West ----- S.W 148 



North-West _ - - - - N.W 12 



North - - - - N 87 



East — - - - - E 191 



No locality — ... - s. 1. (sine loco) 7 



Total... 572 samples 



In case a form is found in no more than 3 samples, these are 

 noted and the name of the collector is added. 



*) The letters in brackets, affixed to the names of the collectors indicate the 

 abbreviations of their names as used in the text; f signifies that the person is by 

 now deceased. 



1* 



