To the study of the lichen biotas of Urup and Simushir islands (Kuril Islands, Sakhalin Region, Russian Far East)

The paper provides the list of 132 lichens and five lichenicolous fungi new for Urup and/or Simushir islands. For all species the substrates, biotopes, localities, and the nearest known localities are given. Among them, Biatorella conspurcans is new for the Russian Far East, Cladonia glauca, Epilichen scabrosus, Muellerella lichenicola, and Xanthomendoza borealis — for the Sakhalin Region. Nine lichen species are reported for the first time for the Kuril Islands. Bryocaulon pseudosatoanum, Cetreliopsis asahinae, Lobaria pulmonaria, Ricasolia virens, and Sticta limbata are listed in the Red Data Book of Russian Federation.