Four new taxa of Chroodiscus (thelotremoid Graphidaceae) from Southeast Asia

Four new taxa of the lichenized, foliicolous ascomycete genus Chroodiscus are described from Southeast Asia: Chroodiscus defectus Papong & Locking, Ch. homchantarae Papong & Locking, Ch. khaolungensis Papong & Locking and Ch. khaosokensis Papong & Locking. Chroodiscus aryillaceus (Moll. Arg.) Locking & Papong (= Chroodiscus parvisporus Kalb & Locking) is introduced as new combination. The genus as currently circumscribed now includes 14 taxa, which are keyed out here. A short discussion on the putative evolution and taxonomic treatment of species pairs in this genus is included.