Abstract
The genus Ceratocystiopsis ( Ophiostomatales , Ascomycota ) includes 21 species, which can be found mainly in association with bark beetles in the Northern Hemisphere. A survey of Ceratocystiopsis species associated with bark beetles infesting Picea abies and Pinus sylvestris in Norway yielded 126 isolates, representing Ceratocystiopsis neglecta and Ceratocystiopsis rollhanseniana , and four species described herein as Ceratocystiopsis chalcographii , Ceratocystiopsis debeeria , Ceratocystiopsis norroenii and Ceratocystiopsis troendelagii . The new taxa were morphologically characterised and phylogenetically analysed on the basis of sequence data of multiple loci (ITS, LSU, beta-tubulin ( TUB2 ), calmodulin ( CAL ) and translation elongation factor 1-alpha ( TEF1 ) genes). Ceratocystiopsis norroenii and C . rollhanseniana were the most frequently isolated species, and the latter species had the wider vector range.