Dothideomycetes » Naetrocymbaceae

Tomasellia

Tomasellia A. Massal., Flora, Regensburg 39: 283 (1856).

Index Fungorum number: IF 5489; Facesoffungi number: FoF 07881, 6 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on smooth bark of trees and shrubs. Sexual morph: Ascostromata solitary to gregarious, immersed becoming erumpent, finally superficial, irregular, black to dark brown, membranous, multilocules. Locules immersed in ascomata, globose to subglobose, usually with flat base, each locule with a short, central ostiole. Peridium thin, composed of one layer of hyaline to brown cells of textura angularis to epidermoidea. Hamathecium gelatinous, comprising hyaline, septate, cellular pseudoparaphyses. Asci 8-spored, bitunicate, broad clavate to elongate-subglobose, with an ocular chamber, and occasionally with a short-pedicel. Ascospores elongate-ellipsoid, hyaline, uniseptate, smooth-walled, upper cell larger but lower cell longer, constricted at the septum, gelatinous sheath not observed. Asexual morph: Unknown (adapted from Doilom et al. 2018).

 Type species: Tomasellia arthonioides (A. Massal.) A. Massal.

Notes: Tomasellia is characterised by solitary to gregarious, immersed ascostromata, broadly clavate to elongate-subglobose asci and elongate-ellipsoid, hyaline, uniseptate ascospores lacking a gelatinous sheath. Tomasellia resembles Mycoporum in having compound ascomata with black contents, comprising several locules, individually forming their own ostiole (Harris 1995). Harris (1995) transferred several species of Tomasellia to Mycoporum (Mycoporaceae) based on morphology and accepted five non-lichen forming species in Tomasellia. Harris (1995) demarcated these two genera based on ascus, ascospore, conidial and hamathecial features. Sanderson and Coppins (2009a, b) followed the generic delineation used by Harris (1995) while (Aptroot 2002a, b) used a different circumscription of these two genera. Tomasellia is a distinct genus in Naetrocymbaceae but lacks molecular data. Fresh collections with DNA sequence data will help to confirm the taxonomic placement of the genus.

 

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