25*2 .loiis novr: iM;ri.i«si:N 



viz : Siiluvriizijiid Uicnudrnin, S. .hiprli and Scfiloiieind Chthonoplusies, 

 besides nu'iilioning OsviUalorid clajdus. and liiially a lusly red Oscilld- 

 torid whiili lu' considt'iTd lo he a new species giving it, however, 

 nt) nainr. Slci- iisl ru p' s samples are still exlant al llic Hotaiiical 

 Museinn. wliero I have had tiie opporlunity ol" examining llieni 

 ane\\ it was tlicn showii thai: — 



Sciildntinii chlhonopldsles Liebin. (Fl. dan. lal). 2398,2) = Scylo- 

 ncmd inirdhilt' (Dillw.) Hornet 



Sj)h(vro:ii<ja .hipcli Liebni. (Fl. dan. tab. 2399,i) — Hapdlosiphdn 

 Idniinosns ((>olin^ Hansg. 



SphdTozip/a Ihcrmarum Liebni. (Fl. dan. tab. 2399,^) — Hdpalo- 

 siplion Idminosus (Cohn) Hansg. 



Oscilldlorid clegans (Fl. dan. tab. 2517,2) — Sijmploca muscuriini 

 (Ag.) Gom. 



Oscilldtorid sp. {riifescens Licbm. in schedula) = Schizothri.v cdl- 

 cicohi (Ag.) Gom. 



Seeondly Flirenberg US43, in which is recorded 50 species ol" 

 Dialoms from Iceland. 



Lauder Lindsay in a laler work (1867) mentions a number 

 ol llie algae, thai were comprised in his first treatise on the vege- 

 tation ol Iceland; he adds merely 9 species of Dialoms ol" which 

 the majority are marine or fossils, some are, on the whole, doublful 

 species. M'Nab(1867) mentions G genera of Diatoms from the hot 

 springs, without having determined the species. 



Then a number of years passed without anybody, as far as I 

 know, contribuling anylhing to the knowledge of the fresh-water 

 algal llora of Iceland. Nol unlil 1(S93 when P. Hariol i)ul)lished 

 his: "(U)ntril)ution a l'étude des Algues d'eau douce d'lslande" in 

 which 10 sj)ecies of (Ajdnophijceæ, 24 species of Chlorophijceæ are 

 mentioncd. The same species are mentioned by É. Belloc (1894) 

 wilh the addition of 34 species of Desmidiaceæ and 7(5 species of 

 Dialomaci'iv, besides some varieties. The two latter algal groujjs 

 llariol did not deal with at all. 



The nexl work of importance is by F. Børgesen (1898) who 

 treats of a collection of fresh-waler algae, brought home by A. Fed- 

 dersen. Børgesen mentions 5<S species of Desmididceæ, 27 other 

 Chlorophijceæ and one Fld(felldh\ whereas Didionuneæ and Ciidiio- 

 phija-d- are nol taken into consideration. In 1900 Rosen vinge 

 described a l'loridea thai ;^rew in a cave on Ihc \'estman Islands 



