Tiarospora Sacc. & Marchal, Revue mycol., Toulouse 7(no. 26): 148 (1885).
Saprobic or pathogenic on host. Sexual morph: Unknown. Asexual morph: Conidiomata scattered, gregarious, immersed to semi-immersed, uniloculate, globose, glabrous, brown, ostiole central, with short papilla. Conidiomata walls thick, composed on several layers, outer layers comprising thick-walled dark brown, flattened cells of textura angularis, inner layers comprising thin-walled paler cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells holoblastic, sympodial, discrete, doliiform, cylindrical or lageniform, hyaline, smooth-walled. Conidia didymosporous, broadly ellipsoid, with obtuse to flattened ends, hyaline to pale brown,uniseptate, continuous, thick and smooth-walled, with guttules or irregular or cap-like gelatinous appendage (adapted from Sutton 1980 and Phookamsak et al. 2015).
Type species: Tiarospora westendorpii Sacc. & Marchal
Notes: Tiarospora is characterised by immersed to semi-immersed, uniloculate, globose conidiomata, holoblastic, sympodial, discrete, doliiform, cylindrical or lageniform conidiogenous cells, and broadly ellipsoid,uniseptate conidia. Tiarospora previously comprised four species T. deschampsiae, T. perforans, T. pirozynskii and T. westendorpii. Aptroot (2006) transferred T. perforans to Montagnulaceae. Tiarospora resembles Tiarosporella but differs in conidial morphology (1-septate in Tiarospora vs. aseptate in Tiarosporella). Kirk et al. (2001, 2008) accommodated Tiarospora in Phaeosphaeriaceae and this was followed by Wijayawardene et al. (2012). Oertel (2011) reported that the type species, T. westendorpii is the synanamoph of Amarenographium metableticum, which is the asexual state of Amarenomyces, a distinct genus in Phaeosphaeriaceae. Phookamsak et al. (2014) tentatively placed Tiarospora in Phaeosphaeriaceae. Molecular data is lacking for the genus. Fresh collections and sequence data are needed to confirm the taxonomic placement of Tiarospora.