Order
Bartheletiales
Bartheletia paradoxa. Photo: (c) James K. Douch, some rights reserved (CC BY-SA)
Bartheletia paradoxa is a species of dimorphic fungus and is the only member of the genus Bartheletia. Bartheletia is the only genus in the family Bartheletiaceae, which is the only family in Bartheletiales, which in turn is the only order in the class Bartheletiomycetes. It infects the freshly fallen leaves of Ginkgo Biloba in the Autumn and persists through winter. Infection of a G. biloba leaf appears as tiny, sporadic black dots.
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