Isolations of microorganisms were made from the sapwood of Norway spruce (Picea abies) (L.) Karst. infested by the spruce bark beetleIps typographusL. The most important group of fungi isolated, the species of Ophiostomataceae, is treated. Ten species were isolated, of whichOphiostoma polonicumSiem. appears to be the most active invader of the sapwood. Three new species are described,Ophiostoma ainoaesp. nov.,O. flexuosumsp. nov. andO. cucullatumsp. nov. and three new combinations are proposed,O. davidsonii(Olchow.&Reid.) comb. nov.,O. europhioides(Wright&Cain) comb. nov. andO. sagmatospora(Wright&Cain) comb. nov.
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