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Abstract
A new species belonging to the Dothideomycete genus Acanthostigma is described from bark of two Nothofagus species from Argentina. Its identity as a new species is based on both morphology and molecular sequence data. Acanthostigma patagonica differs from other species in the genus by having larger ascomata and setae and wider, asymmetrical ascospores. An amended key to Acanthostigma species is provided along with a discussion of other species previously described from South America.
Acknowledgments
The Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET: PIP 5660 and PIP 80101000), the Universidad Nacional del Sur (UNS: PGI) and the National Science Foundation ( DEB-08-44722) are thanked for financial support.
We thank Marta Garelli for assistance with the Latin description.