A new species of Bertia collected in southern China is described and illustrated. Bertia hainanensis is characterized by a combination of such features as non-ostiolate ascomata with a roughened tuberculate surface, 1-septate cylindrical-geniculate ascospores, and filiform
paraphyses. It is most similar to B. tropicalis, from which it differs by its narrower ascospores and its filiform paraphyses. The distinctive features of the ascomatal surface were examined with a scanning electron microscope. The validity of the family Bertiaceae is discussed.
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