Ainsworthia is a genus of fungi in the family Chaetothyriaceae.

The genus was circumscribed by Augusto Chaves Batista and Raffaele Ciferri in Sydowia Beih. vol.3 on page 4 in 1962.

The genus name of Ainsworthia is in honour of Geoffrey Clough Ainsworth (1905–1998), who was a British mycologist and scientific historian.

Species As accepted by Species Fungorum; Ainsworthia lecythidacearum Ainsworthia oblongotheca Ainsworthia psidii Ainsworthia roraimensis Ainsworthia smilacina Ainsworthia zanthoxyli

Former species; A. morindae = Phaeosaccardinula morindae, Chaetothyriaceae A. negeriana = Teichosporella negeriana, Dothideomycetes family A. seaveriana = Phaeosaccardinula seaveriana, Chaetothyriaceae

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