Abstract
AbstractFive new species and one new record ofAstrothelium(Trypetheliaceae) are reported from Thailand. Phylogenetic analysis of four DNA loci (ITS, nuLSU, mtSSU rDNA andRPB1) demonstrated the placement of the new species withinAstrothelium, as well as their distinction from similar or related taxa. The new species are:A. flavocoronatum, with a yellow pigment surrounding the ostiole, and 3-septate ascospores 22–28×8·0–9·5 µm;A. macrostiolatum, with large whitish ostiolar area, a hamathecium inspersed with small oil droplets, and 9–11-septate ascospores 80–100×17–19 µm;A. neglectum, with lichexanthone on the thallus and pseudostromata, a non-inspersed hamathecium and 3–5-septate ascospores 21–25×7·5–9·5 µm;A. neovariolosum, with inspersed hamathecium and 3-septate ascospores 17–23×6–7 µm; andA. siamense, with inspersed hamathecium and 4–7-septate ascospores 30–50×10·5–12·0 µm.Astrothelium aenascensis reported from Thailand for the first time.
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