. Soc. Fauna Brabet, Gonyostomum semen (Raphidophycées), nuisance. Mem. «The phytoplankton of sorne subarctic lakes in Finnish Lapland». The phytoplankton of some subarctic lakes in Finnish Lapland. BRABET, «Gonyostomum semen (Raphydophycées), nui- sance potentielle des grands.