Agaricoid fungi new to Leningrad Region, Russia

Information on 18 species recorded for the first time in the Leningrad Region is given, including seven (Atheniella leptophylla, Cystoagaricus sylvestris, Lepiota subalba, Mycena mirata, Pluteus ephebeus, Psathyrella longicau-da and Psathyrella pygmaea) previously not known from the north-west of European Russia. The species are annotated with comments on ecology, and colour illustrations of basidiomata are provided. Three species are recommended for the next edition of Red Data Book of the Leningrad Region: Atheniella leptophylla as confined to limestone outcrops, rare in the region, and Cystoagaricus sylvestris and Pluteus aurantiorugosus vulnerable due to substrate confinement to elm wood.