FRESH-WATER DIATOMS FROM ICELAND 



77 



dilatatum 



dubium 



fasciatum 



Hitchcockii 



incurva 



Iridis 



productum 



Nitzschia 



amphibia 



— acutiusc. . . 



— Frauenf. . . 



angustata 



apiculata 



commutata 



debilis 



Denticula 



dissipata 



Frustulum 



Hantzschiana glacial 



Heufleriana 



intermedia 



Kittli 



Kützingiana 



linearis 



Nathorsti 



Palea 



— fonticola 



— minuta 



— tenuirost 



serians 



Sigma 



- Clausi 



sigmoidea 



sinuata 



stagnorum 



thermalis 



— minor 



subtilis 



Tryblion. Vict 



vitrea recta 



— salin 



Oestrupi 



Universal distribution 



Eur. Af. As. Am. Aust. Grl. J.M. R.E. Spb. FÜ 



Distribution in the 



different parts 



of Iceland 



S. S.W. S.W. N. E. 8.1 



