Jahnula is a genus of aquatic fungi in the family Aliquandostipitaceae.

[1] The genus was first named by Wilhelm Kirschstein in 1936.

[2] The genus name of Jahnula is in honour of Eduard Adolf Wilhelm Jahn (1871–1942), German botanist (Mycology) and teacher in Berlin.

[3] The genus was circumscribed by Wilhelm Kirschstein in Ann.

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