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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.), Professor A. Feddersen (A. F.), Professor Chr. Granlund (Grld.), Professor Th. Holm (Ho.), cand. mag. Hjalmar Jensen (Hj. Js.), Dr. phil. Helgi Jonsson (H. Js.), Professor Dr. phil. L. Kolderup Rosenvinge (K. Rsv.), Dr. phil. C. H. Ostenfeld (C. H. O.), Professor Dr. phil. K. Rordam (Rd.), Professor Jap. Steenstrup (Stp.), Skoleforstander St. Stefansson (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 case a form is found in no more than 3 samples, these are noted and the name of the collector is added.
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