Morphological characters and genetic markers from 35 single-ascospore isolates of a Venturia sp. collected from Populus tremula were
analysed. The morphological data were compared with the literature, and genetic markers were amplified for comparison with
isolates of V. populina, V. macularis and V. ditricha. According to ascospore morphology the fungus resembled V. populina, but the
morphology of the conidia was closer to Pollaccia radiosa (the anamorph of V. macularis). Analysis of 49 RAMS markers, variation
within the internal transcribed spacer (ITS) sequence of the ribosomal gene cluster and a single marker locus derived from RAMS
fingerprint suggested that the Venturia is a previously undescribed species.