80 



ERNST ØSTRUP 



423 

 424 

 425 

 426 

 427 

 428 

 429 

 430 

 431 

 432 

 433 



436 

 437 

 438 

 439 

 440 

 441 

 442 

 443 

 444 

 445 

 446 

 447 

 448 



449 

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 451 

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 458 



anceps gracilis . . . . 



— hyalina 



— linearis . . . . 



— siberica. . . . 



javanica 



Legumen 



obtusa 



parvula prod 



Phoenicenteron . . . , 



— amphil. 

 Smithi 



Stenopterobia 



434 intermedia 



Stephan od ise us 



435 I Astræa 



Surirella 



biseriata 



Engleri ang 



linearis 



— constricta . . . 



Mölleriana 



ovalis angusta 



— minuta 



— ovata 



— pandurif. . . . . 



— pinnata 



robusta 



— splendida . . . 

 turgida 



Synedra 



Acus 



— delicatiss 



mesoleja 



amphicepli 



— austriaca 



capitata 



famelica minusc. 

 familiaris major 



pulchella 



— navicul. 



Universal distribution 



Kur. 



Distribution in the 



different parts 



of Iceland 



S. S.W. S.W. N. E. s.l 



X 

 X 



X X 



X X 



X X 



X X 



X X 



X 



X 

 X 



X 

 X 



X X 



X X 



X 

 X 



X 



X 



X 

 X 



I X 



