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The following three new species of Trypetheliaceae are described from Sri Lanka: Astrothelium inspersoconicum, A. isohypocrellinum, and Polymeridium fernandoi. Ten species are newly recorded from Sri Lanka: Astrothelium flavoduplex, A. galligenum, A. scoria, A. straminicolor, Constrictolumina planorbis, C. porospora, Dictyomeridium proponens, Marcelaria cumingii, Polymeridium jordanii, and Pseudopyrenula media.