New locations of rare and endangered lichen species in the Zavolzhye region of the Chuvash Republic

Abstract

The paper presents new data on rare and endangered lichen species found in the Trans-Volga Region of the Chuvash Republic from 2015 to 2020. Zavolzhye of the Chuvash Republic is the left-bank part of the republic, which is covered with coniferous, coniferous-broadleaved forests. According to the physical and geographical zoning of the Middle Volga region, Zavolzhye Chuvashia is included in the forest zone, province of southern taiga and mixed forests of the Low Volga region, in the mixed forest district, to the Vetluzhsko-Kokshagsky Polessky area, according to botanical and geographical zoning belongs to the Zavolzhsky Lowland-Polesky area of subtaiga forests, according to vegetative zoning to the Zavolzhsky Boreal area. As a result of field studies we found new habitats of 11 rare and endangered lichen species: Agonimia flabelliformis, Cetraria islandica, Cladonia stellaris, Mycobilimbia epixanthoides, Mycobilimbia carneoalbida, Platismatia glauca, Ramalina dilacerata, Usnea lapponica, Usnea dasopoga, Usnea subfloridana, Xanthomendoza ulophyllodes. For each species, the coordinates of the points of growth, distribution features in the republic, ecological and substratum and phytocoenotic confinement are indicated. The information on ecology and distribution of rare lichen species is clarified. Agonimia flabeliformis is a new and rare species for the Chuvash Republic