Jahnulales (Dothideomycetes, Ascomycota): a new order of lignicolous freshwater ascomycetes

A new order is introduced ( Jahnulales ) to accommodate ascomycetes with stalked/sessile and dimorphic ascomata, hyphal stalk cells that are ca 40 μm wide, and ascospores that are unequally 2-celled with or without various types of appendages or sheaths. The order includes a single family, the Aliquandostipitaceae , and has affinities with the Pleosporales within the Dothideomycetes. Studies on freshwater ascomycetes in Egypt and Thailand yielded one new genus Patescospora , and Jahnula siamensiae sp. nov., and the new combination J. sunyatsenii (syn. Aliquandostipite sunyatsenii ) is made based on molecular results.

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