Tarasova, V., Androsova, V., Sonina, A. and Ahti, T. 2015. The lichens from the City of Petrozavodsk in the Herbarium of the Botanical Museum, University of Helsinki. Folia Cryptogamica Estonica. 52, (Aug. 2015), 41–50. DOI:https://doi.org/10.12697/fce.2015.52.06.