Christensen S.N. 2018: New or rarely reported lichens for Thrace, Greece. – Herzogia 31: 390–394.
Forty five species are reported from Thrace. Tree taxa, Cladonia caespiticia, Dermatocarpon luridum, and Vahliella leucophaea, are new to the Greek mainland, and 34 taxa are new to Thrace. This is at the same time a first record of lichens on Quercus frainetto in Greece.