Foliicolous material of the lichenized genus Porina was collected in different types of forest in Thailand. Three new species were discovered: P. subatriceps Naksuwankul & Lücking, characterized by a yellowish brown, K+ reddish involucrellum and oblong, 7–11–septate ascospores, P. lumbschii Naksuwankul & Lücking, with large, muriform ascospores, and P. thailandica Naksuwankul & Lücking, having, small, oblong, 3–septate ascospores and a dark brown to black, K–involucrellum, morphologically close to P. homala and P. subhomala which differ by having 7–septate ascospores. An artificial key to species for a total of 55 taxa found in Thailand is provided and 20 new records are listed for the country.
Five new species of Graphidaceae are described from Thailand. Molecular evidence and phenotypical characters support their independent status from related and similar species. Glaucotrema thailandicum Naksuwankul, Lücking & Lumbsch is unique within the genus in having submuriform ascospores. Ocellularia klinhomii Naksuwankul, Lücking & Lumbsch is characterized by having a whitish gray, rimose thallus with ascomata in verrucae and surrounded by a black ring and lack of secondary metabolites. Ocellularia phatamensis Naksuwankul, Parnmen & Lumbsch has a grayish, thick and rimose thallus, differing from O. klinhomii in lacking a dark apothecial rim and having ascomata that are not immersed in verrucae. Ocellularia thailandica Naksuwankul, Kraichak & Lumbsch differs from O. albocincta in lacking a columella. Ocellularia rotundifumosa Naksuwankul, Lücking & Lumbsch differs from O. fumosa in having ascospores with rounded ends. An epitype for O. krathingensis is selected.
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