The Marine Algæ of Iceland. 



(I. Rhodophyceæ.) 



By 



Helgi Jönsson. 



Introduction. 



The first work mentioning Icelandic seaweeds is 0. F. Mül- 

 lers Enumeratio stirpinm in Islandia sponte crescentium 1 ). The 

 later lists up to the middle of the last century are chiefly based 

 upon this work. As the earlier literature has been critically treated 

 by H. F. G. Ström felt in his book: Om algvegetationen vid 

 Islands kuster 2 ), I shall not here enter upon the subject, but only 

 refer to Strömfelts work. 



In the following paper I only mention such Icelandic species 

 as I have seen myself. The collections to which I had access are 

 the following: 



I. Old collections in the Botanical Museum at Copenhagen 

 from the first half of the last century; as a rule nothing is written 

 on the labels except that the plant has been gathered in Iceland, 

 and generally the name of the collectors is not given, excepting 

 some very few as Mörck (travelled in Iceland 1821), F. Faber 

 (travelled in Iceland 1819 — 1821) and Japetus Steenstrup (tra- 

 velled in Iceland 1840 — 1841). These collections are not mentioned 

 by Strömfeit (1. c). 



1 ) Nova acta Physico-Medica Academiæ Cæsareæ Leopoldino-Carolinæ naturæ 

 curiosorum. Tomus IV. Norimbergæ 1770. 



2 ) Göteborgs Kongl. Vetenskaps och Vitterhets samhälles Handlingar. Ny 

 tidsföljd, 21. haftet. Göteborg 1887. 



Botanisk Tidsskrift, 24. Bind. 9 



