210 



are according to Flahault's determination identical willi Tolypothrix la- 

 nata (Desw.) Wartem. Joh. Schmidt (1. c. p. 383) gives these two species 

 — T. tenuis and T. lanata — under tlie name of T. tennis Kiitz. emend. 



Anotlier specimen in Lyngbye's Herbarium determined by him as 

 Scytonema ocellatuml and collected, »in scrobiculis aquæ dulcis ad littus 

 Eldevig, Osteroe«, and labelled in Lyngbye's handwriting: »Ramuli in hoc 

 exemplum liaud gemini, sed simplices ut in deliniatione Dillwyniana 

 Conf. oscillator.« appears to me also to belong to this species. Again 

 anotlier of Lyngbye called Scytonema myochroas inundatuni infans (comp. 

 Hydrophj't. p. 96) is according to Flahault this species. In Bornet and 

 Flahault's »Revision« p. 121 Oscillatoria distorta is mentioned as a syno- 

 nym on the faitli of specimens in Thuret's Herbarium. 



I have found this species in gatherings from Thorshavn (Str.); Selle- 

 træ (Ost.); Midvaag (Vaago); Kvalbo (300 m.) and Trangisvaag (Syd.). 



36. Desmonema Wrangelii (Dilhv.) Born. and Flah. 

 A small fragment of this alga has been found in a gathering from 

 a stream near Vedvig on Vi der 6. 



Order VII. NOSTOCACEÆ. 



37. Nostoc carneum (Lyngb.) Ag. 



Lyngbye calls it Xostoc commnne (3 carnenni (Hydrophyt. p. 199). 

 In Lyngbye's Herbarium there are some specimens of this species from 

 Hojvig (Str.); and Eldevig (Ost.); they are determined by Flahault. 

 Professor Warming gathered it on rocks near Trangisvaag (Syd.). 



38. N. commune Vaucli. 



Mentioned by Lyngbye as found in the Færoes (Hydrophyt. pp. 1 98 

 —99) but no specimens of this species from the Færoes are to be found 

 in Lyngbye's Herbarium. 



The species mentioned by Landt^ as Tremella Nostoc is probably, 

 as Wille (1. c. p. 22) also means, identical with this species. 



39. N. pruniforme Ag. 



Found in a ravine at Kvanhauge near Trangisvaag (Syd.). Mr. Joh. 

 Schmidt has kindly determined it for me. 



Rostrup (1. c. p. 92) is doubtful as to the correctness of the deter- 

 mination of Nostoc paliidosnm Kiitz. and N. mimitissinmm Kiitz.; according 

 to Bornet and Flahault (Revision p. 221) the latter cannot be regarded 

 as a distinct species. 



40. Anabæna variabils Kiitz. 



Amongst Cladophora Lynybyei nov. spec. in »Gjov« near Trangis- 

 vaag (Syd.). 



41. Nodularia sphærocarpa Born. and Flah. 



Found by Wille fl. c. p. 22) in collections from Kirkebo (Str.). 



^ J. Landt: »Forsog til en Beskrivelse over Færøerne«, Kjobenhavn 1800, p.225. 



