[in Russian with English abstract: ] The results of lichenological research conducted for the first time in the parks of the museum-reserve D.I. Mendeleev and A. A. Blok (Moscow oblast): «Shakhmatovo» (39.2 ha), «Tarakanovo» (4.5 ha), «Boblovo» (25.4 ha) are presented. 122 species: 115 lichens, 6 non-lichenized fungi and a lichenicolous fungus from 58 genera included in 30 families were identified. 103 species were found in «Shakhmatovo», 61 species in «Tarakanovo» and 60 species in «Boblovo». Findings of Alyxoria culmigena («Shakhmatovo»), Lecanora subcarpinea («Tarakanovo»), Peridiothelia fuliguncta, Toniniopsis separabilis («Shakhmatovo»), Xanthocarpia crenulatella («Shakhmatovo», «Tarakanovo», «Boblovo») are new for the Moscow Region. The spectrum of the first five leading families of the park lichen flora of the museum-reserve D. I. Mendeleev and A. A. Blok is close to that of natural forest communities, which, coupled with the completeness of the spectrum of ecobiomorphs and eco-logical-substrate groups, the presence of species of natural forest lichen flora, rare and indicator species characterizes the condition of the studied lichen flora as close to natural zonal, with a slight level of anthropogenic transformation. Keywords: Biodiversity, indicator species, lichens and allied fungi, Moscow Region, old park, rare species, Red Data Book.