Three new species of Chapsa (lichenized Ascomycota: Ostropales: Graphidaceae) from tropical Asia

Three new species of Chapsa in the family Graphidaceae are described from tropical Asia. Chapsa mastersonii Rivas Plata, Lumbsch & Lucking from the Philippines is characterized by large apothecia with thickly white-pruinose discs, large, muriform, non-amyloid ascospores, and the stictic acid chemosyndrome. Chapsa wijeyaratniana Weerakon, Lumbsch & Lucking from Sri Lanka has apothecia similar to the preceding species but forms an ecorticate thallus with maculiform to capitate soralia, has small, submuriform ascospores, and lacks secondary substances. Chapsa wolseleyana Weerakon, Lumbsch & Lucking forms apothecia with red to pinkish or purplish red discs and large, muriform ascospores becoming pale brown.