199 



Herbarium, in the Botanical Museum, Copenhagen, it has been 

 possible to revise Lyngbye's old determinations so that we now 

 know, excepting some species of which the material was altogetlier 

 wanting or too badly preserved to be fit for determination, which 

 species are identical with Lyngbye's determinations. With regard 

 to some of the specimens, Bornet and Flahault, Gomont, Gay 

 and others had already made similar determinations, partly on the 

 faith of specimens from Thuret's Herbarium, which contains a few 

 of Lyngbye's original specimens and partly by utilising the museum 

 in Copenhagen ^. 



The following larger contribution is due to Dr. E. Rostrup 

 who in 1867 traversed the Færoes in company with Mr. Feilberg. 

 In »Færøernes Flora« Rostrup mentions nearly seventy species of 

 freshwater algæ, and as the determinations of the freshwater algæ- 

 material collected by Rostrup and Feilberg are due to Dr. Nord- 

 stedt, Lund, the great advantage is that they may be regarded as 

 up to date even if, after so long a period, a diOerent opinion has 

 arisen on some points. 



Finally in »Botaniska Notiser«, 1897 (that is to say after I be- 

 gan tilis work), Wil le has given in an interesting paper — »Om 

 Færøernes Ferskvandsalger og om Ferskvandsalgernes 

 Sprednings maader« — a smaller contribution to the knowledge 

 of the freshwater algæ of the Færoes. Wille had from time to 

 time received from his former pupil, Mr. Johannes Patursson 

 (»Kongsbonde«, Kirkebo), specimens of freshwater algæ which 

 were rather destitute of species. Wille found altogetlier only 42 

 species of which 16 were already known from the Færoes. Wille's 

 list comprises about 100 species, all previously known species being 

 included ; besides, Wille has tried to criticise Lyngbye's determina- 

 tions in »Hydrophytologia«, as far as it could be done without 

 having original specimens at band to which to refer. 



Though Wille emphasizes that no collection of algæ has been 

 made from the Færoes by any algologist after Lyngbye and that 

 further investigations may possibly add new species to the list of 

 the Færoese freshwater algæ, still he arrives at the conclusion that 



^ In Horne man ns »Forsøg til en dansk øconomisk Plantelære«, and in 

 Trevelyans »On the Vegetation and Temperature of the Faroe Islands«, freshwater 

 algæ from the Færoes are mentioned, but thej- appcar to be only an extract from 

 Lyngbye's Hydrophyt. Trevelyan with regard to the algæ merely refers to Lyng- 

 bye, he, however, specially mentions Tremella Nostoc. 



