Tomasellia A. Massal., Flora, Regensburg 39: 283 (1856).
MycoBank number: MB 5489; Index Fungorum number: IF 5489; Facesoffungi number: FoF 07881; – 6 morphological species (Species Fungorum 2020), molecular data unavailable.
Type species: Tomasellia arthonioides (A. Massal.) A. Massal., Flora, Regensburg 39: 284 (1856).
Notes: The morphology of Tomasellia has often been discussed with reference to Mycoporum based on compound ascomata containing several locules, each producing their own ostiole (Harris 1995). These two genera can be distinguished based on ascus, ascospore, conidial and hamathecial characters (Harris 1995). Harris (1995) transferred most species of this genus to Mycoporum (Mycoporaceae), and accepted only five non lichen-forming species in Tomasellia. The generic delimitations in Harris (1995) have been accepted by Sanderson and Coppins (2009a, b), while others accept a different circumscription (Aptroot 2002b, c). Although, sequence data is not available for Tomasellia, it is accepted as a genus in Naetrocymbaceae in many studies (Hyde et al. 2013; Wijayawardene et al. 2017a; Doilom et al. 2018).