Trichometasphaeria Munk, Dansk bot. Ark. 15(no. 2): 135 (1953).
Index Fungorum number: IF 5561; Facesoffungi number: FoF 12519, 5 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on host. Sexual morph: Ascomata superficial with bases seated on decorticated twigs, separate to gregarious, spherical or ellipsoidal, with small apical papilla composed of setae; setae dark brown with tip paler, septate, erect or curved. Peridium of small dark brown pseudoparenchymatous cells. Asci 8-spored, clavate. Pseudoparaphyses narrowly cellular, septate, branched. Ascospores overlapping biseriate, ellipsoid-fusiform, some curved or vermiform, 1−3−5-septate, constricted at median septum, hyaline, becoming light-brown at maturity, with two end cells paler; wall verruculose. Asexual morph: Unknown (adapted from description of Trichometasphaeria papillisetosa in Yuan and Barr 1994).
Type species: Trichometasphaeria dianthi (Rostr.) Munk
Notes: Trichometasphaeria is characterised by spherical or ellipsoidal ascomata, clavate asci, and ellipsoid-fusiform, vermiform, 1−3−5-septate ascospores. Bose (1961) listed Trichometasphaeria in Keissleriella and this was followed by subsequent authors (Müller and Arx 1962; Arx and Müller 1975; Eriksson and Hawksworth 1987). Trichometasphaeria resembles Keissleriella in having setae within the ostioles but differs in ascoma centrum (Barr 1990). Barr (1990) considered Trichometasphaeria as distinct from Keissleriella and referred it to Lophiostomataceae. Several authors added new species to Trichometasphaeria (Barr 1992; Scheuer 1999; Chlebicki 2009). Trichometasphaeria also resembles Passeriniella in ascospores morphology but differs in that the latter has immersed ascomata without setae on or in the ostioles, and the ascospores are deeply pigmented in the mid cells (Yuan and Barr 1994). Kirk et al. (2013), and Wijayawardene et al. (2017, 2020) listed Trichometasphaeria in Dothideomycetes genera incertae sedis. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the systematic position of Trichometasphaeria.
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