FRESH-WATER DIATOMS FROM ICELAND 



79 



nodosa 



Oculus 



parallcla crassa 



parva 



— Lagerst 



Paulensis 



platj'ceph 



secernenda 



stauroptera 



interr. 



stomatoph 



streptoraphe 



— minor . . . 



subcapitata 



— paucistr 



suhlinearis 



subsolaris 



viridis 



— commut 



— fallax 



— intermedia 



— leptogong 



— rnpestris 



Rhizosolenia 



eriensis 



palndosa 



Rhoicosphenia 



curvata 



Rhopalodia 



gibba 



gibberula 



— rnpestris .... 



gracilis 



parallcla 



uncinata 



ventricosa 



Stauroneis 



acuta 



anceps 



— birostris 



Universal distribution 



Eur. Af. As. Am. Ausl. Ilrl. 



J.M. B.E. Spb. Fz.J 



X 

 X 



xx x 



x 



X X 



X X 



X 



X 



X XXX 



X 



X x 



X 



X 



X X 



X 



X X 



XXX 



■ 



X 

 X 

 X 

 X 



■ 



X 

 X X X X X 



Distribution in the 



different parts 



of Iceland 



S. S.W.N.W. \. 



