This paper provides data on 26 new, rare, and interesting species of lichens discovered in the city of Moscow and Moscow Region during the field studies in 2014–2022, of which 21 species are new to the study area. Fellhaneropsis vezdae is new to the European part of Russia, and Briancoppinsia cytospora, Thelidium minimum, and Verrucaria inaspecta are new to the Central Russia. The list of lichens and allied fungi of the city of Moscow and Moscow Region currently includes 493 species.

Работа посвящена распространению в Московском регионе Ramalina europaea Gasparyan, Sipman et Lücking. Вид сравнительно недавно выделен из Ramalina pollinaria-group, включен в Красную книгу города Москвы и предложен к занесению в список охраняемых видов лишайников Московской области. Ревизия образцов Ramalina pollinaria и R. farinacea, собранных с начала ХХ в. до начала ХХ1 вв. в гербарии MW показывает, что вид встречался в Московском регионе и в этот период. В результате объединения полученной информации с новыми данными о находках Ramalina europaea при нанесении на карту удалось получить актуальные сведения о географии и экологии вида, а также о его обилии в Московском регионе.

Records of fifteen species of lichenized and ten species of lichenicolous fungi are presented. Lecanora substerilis, Rufoplaca subpallida, Sarcogyne praetermissa and Verrucaria fuscoatroides are reported as new for Russia. Didymocyrtis epiphyscia s. lat., Epithamnolia longicladoniae, Lecanora barkmaniana and Sclerococcum epicladonia are new for the European part of Russia, and Arthonia phaeophysciae, Bacidina mendax, Cladonia novochlorophaea, Gyalecta carneola, Lichenoconium aeruginosum and Verrucaria pilosoides are new for central European Russia. A further nine species (Cliostomum corrugatum, Gyalecta derivata, Lichenoconium lecanorae, Micarea soralifera, Physciella chloantha, Taeniolella phaeophysciae, Talpapellis beschiana, Telogalla olivieri, Verrucaria ochrostoma) were rarely observed in central European Russia previously. Short notes on the characters and the geographic distribution of the species are provided.

We present the results of lichenological research in the parks of the museum-reserve Abramtsevo, the museum-reserve of A. S. Pushkin and the museum-estate Ostafyevo – Russian Parnassus, for which no previous data were available. The checklist of lichen biota contains 103 species including 98 lichens, a lichenicolous fungus and 4 non-lichenized fungi. 55 species were found in the park of the museum-reserve Abramtsevo, 58 species in the museum-reserve of A. S. Pushkin (estates Vyazemy – 51 and Zakharovo – 29) and 69 species in the museum-estate Ostafyevo – Russian Parnassus. Lichenochora obscuroides (Ostafyevo) is new for Central Russia. Cladonia macilenta, Evernia prunastri and Usnea hirta (Ostafyevo) are listed in the Red Data Book of Moscow. Parmelina tiliacea (Abramtsevo, Vyazemy), Ramalina farinacea, Usnea dasopoga and U. subfloridana (Abramtsevo) are listed in the Red Data Book of the Moscow Oblast. Chaenotheca chrysocephala, Melanelixia subargentifera, Parmelina tiliacea, Physconia perisidiosa and Ramalina europaea (Ostafyevo) are proposed for inclusion in the next edition of the Red Data Book of Moscow.

The results of the first lichenological studies in the old park of the museum-reserve “Gorki Leninsky” (Leninsky urban district of the Moscow oblast) are presented. The checklist of lichen biota is given including 71 species of lichens and 3 species of allied non-lichenized fungi from 40 genera, 25 families. Acarospora moenium (Vain.) Räsänen, Lecania erysibe (Ach.) Mudd are new species for Moscow oblast. Four indicator species of biologically valuable forest and park communities are identified: Alyxoria varia, Biatoridium monasteriense, Chaenotheca stemonea, Physconia perisidiosa. The absolute index of lichen biota species richness of the park of the museum-reserve “Gorki Leninsky” is higher than in the previously studied parks of the museum-reserve “Abramtsevo”, the museum-reserve of A. S. Pushkin and the museum-estate “Ostafyevo” – “Russian Parnassus”. However, the relative index of species richness (Menchinic Index) of the lichen biota of the park “Gorki Leninsky” is lower than that of the park “Abramtsevo”, located in the area with less anthropogenic load. Nitrophilic species prevail over acidophilic species in the lichen cover of oak and birch, which have an “acidic” pH of bark in the background conditions, in the surveyed part of the territory of the park “Gorki Leninsky”. The revealed ratio of acidophytes and nitrophytes in the lichen cover of oak and birch, and the absence of species highly sensitive to dusting and air pollution indicate a significant anthropogenic load on the surveyed park community, in particular, nitrogen pollution.

The article considers diversity of lichen biota as an indicator of the state of the Moscow region park communities. It is a case study of the park of the museum-reserve Abramtsevo. The study examined the species diversity. Taxonomic, ecological and sozological analyses of the investigated lichen biota have been carried out. On that basis, an assessment of the level of anthropogenic transformation of the lichen biota has been made. Recommendations are developed for the conservation of the habitats of rare lichen species in the park of the museum-reserve Abramtsevo.