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