Ten lichen species and three lichenicolous fungi are reported for the first time for St. Petersburg, the whole Leningrad Region or its western part. The lichens Bacidina indigens and Lecidella asema are new for European Russia, the lichens Bryoria kuemmerleana, Caloplaca turkuensis, Scoliciosporum pruinosum, and the lichenicolous fungus Raesaenenia huuskonenii are new for North-Western European Russia.