254 jons. h(5yk pkterskn 



Nvere f^alluTcd by Helf^i .lonssoii (abbrev. II. .1.) diirin}^ his various 

 explorations in Ihe years 18^)4 — 1915 in diverse parts ol" the island. 

 A nol nninii)ortant nuniber of speciniens were collecled by O la fur 

 Davidsson (O. D.), and the material collccted at the various hot 

 sprinj^s by .lapetus Steenstrup in 18^9— 40 is momentous. More 

 oecasional are the algae rollections of C. H. Ostenfeld (C. H. ().), 

 O.Paulsen (O. P.), Th. Thoroddsen (Th. Th.), Hjalmar Jen- 

 sen (Uj. .1.), .lohs. Gandrup (.1. (i.) and Mogens Lund (M. L.). 

 (A nole of exchunation following the nanie of the collector denotes 

 thai I have seen and exaniined the specinien). In June — August 

 1914 1 niyself travelled in Iceland to collect fresh-water algae. I 

 landed al Sey{Msfj6r()ur 21 June and from there underlook a tour up 

 the FIjolsdalur, primarily via Egilsta(^ir, Vallanes and Hallormstac'^ur 

 along the soulh east coasl of the Lagarlljot lo Vall)j6fstat^ir and from 

 there 1 relurned via the norlh west coast to SeyiMsfjorfiur. From there 

 1 saik'd lo Akureyri, whence I journeyed via Hals and Ljosavaln to 

 Skiilusta<">ir at Mwatn. A i'ew days stop at Geiteyjarstrond permilted 

 a tri|) lo Xamuskard, Ihen via GrimstaQir (Sliitnes), Haildors- 

 stat^ir and Pvera I passed Uxahver and reached Hiisavik. Hcre I 

 had a stay of a few days to a^vait a ship to continue my journey, 

 bul a strong norlherly wind followed by rain and dense fog upset 

 my calculations and these days were practically lost. Then I sailed 

 lo Heykjavik, bul on the way the ship dropped into numerous 

 harbours, and at some of these the stay was so protracled Ihat 1 

 conld land and undertake coUections, for instance at Siglufjor(>ur, 

 isafjurnur, Slykkisholmur. From Isafjor5ur 1 \vandered over the 

 hills lo Flaleyri where again I encountered the ship. 



Taking Heykjavik as a starting point I made two U\\)s viz: — 



1) over tlu" pass Svinaskan") to Modruvellir, further over Geitaberg 

 and Grund up through Reykjadalur to Reykholt, from here to 

 NonMunga wilb a trip to Heigavaln through the Norc^lunga 

 forest and linally to Borg and Borgarnes, whence I relurned by 

 steamer lo Reykjavfk; 



2) via .Mosfellslu'iAi lo I'ingveiiir, further on to Laugarvaln, past 

 Apavaln lo Kotstrond and Heykir, linally via Kolviciarholl back 

 to Reykjavik. 



On the return journey I stayed for some hours al Veslmannaeyjar. 



The whole of the present work has been carried out on the 

 basis of preserved material and Iherefore I have had the oppor- 

 tuiiily of studying the best preservation melhods for blue-green algae. 



