A new species of Lithothelium (lichenized Ascomycota, Pyrenulaceae) from the Tarkine region, north-western Tasmania

Lithothelium kantvilasii sp. nov. (lichenized Ascomycota, Pyrenulaceae) is described from cool-temperate rainforest in the Tarkine region of north-western Tasmania, Australia. It has a whitish and largely endophloeodal thallus, minute, solitary perithecioid ascomata with an apical ostiole and small, hyaline 3-septate ascospores. A key is provided to the seven Australian species of Lithothelium.