ARKIV Füll BOTANIK. 



BAND 14. N:o 9. 



New contributions to the Diatom aceous Flora 

 of Finland. 



By 

 ASTRID CLEVE-EULER. 



With four plates. 

 Communicated February 24th by G. Lagekheiji and C. Lindman. 



Since ray late father. Professor P. T. Cleve, more than 

 twenty years ago, in 1891, published his list of Finlandian 

 diatoms known up to that date, several other forms of these 

 algae, fossil or living, have on different occasions been ob- 

 served in Finland and partly registered. Thus P. T. Cleve 

 himself, soon after his first publication, in 1894 investigated 

 a clay-deposit from Viborg, that was found to contain, besides 

 some diatoms considered typical for deposits from the Ancylus- 

 epoch, also a few marine species, and consequently proved 

 to be an interesting pendant to the deposit of Skattmansö 

 in Uppland, Sweden. Among the Viborg-forms, nine were 

 new to Finland and will be quoted in this paper. 



The plankton-investigations, that have at a later date 

 been carried out by Mr K. M. Levander, have also enriched 

 the flora of Finland with several forms, partly new to science. 



I myself have had the opportunity, repeatedly, to examine 

 numerous samples of earth, clay and turf from Finland, sent 



Arkiv för botanik. Band 14. N':o 9. 1 



