The lichen genus Topeliopsis in Australia and remarks on Australian thelotremataceae

The lichen genus Topeliopsis in Australia is monographed. Four species are kept in this genus, T. acutispora sp. nova, T. corticola sp. nova, T. musci gena comb. nova and T. vezdae sp. nova. The recently described T. muscicola , the type species of the genus, is reduced into synonymy with T. muscigena . The description for the genus is emended. - The monotypic genus Reimnitzi a gen. nov. is described for Thelotrema santense and its position within th e Thelotremataceae is discussed. Thelotrema heterosporum is synonymized wit h Reimnitzia santensis and reported from Australia-NT for the first time; T helotrema nostalgicum and T. vernicosum are new additions to the Australian lichen flora, the latter also for the Mascarene Islands. Thelotrema vernic osum is the correct name for T. piluliferum. - The genus Leptotrema is syno nymized with Myriotrema.