Trematosphaeriopsis
Trematosphaeriopsis Elenkin, Izv. Imp. St.-Peterburgsk. Bot. Sada 1(4): 146 (1901).
Index Fungorum number: IF 5523; Facesoffungi number: FoF 12511, 1 morphological species (Species Fungorum 2022), no molecular data available.
Lichenicolous on thallus. Sexual morph: Ascostromata solitary, scattered, superficial, subglobose, depressed in the center, reddish-yellow, coriaceous, lacking an ostiole. Wall of ascostromata, thick, three layered, with an outer thin layer composed of fragmented or disintegrated tissue, with middle layer composed of orange to reddish-yellow cells of textura angularis, and thick inner layer composed of reddish-yellow to hyaline cells of textura oblita and becoming black when dry; peridium surrounding the locules, composed of hyaline small cells intermixed with ascogenous hyphae and pseudoparaphyses. Locules immersed in the upper part of ascostromata, globose to subglobose, some with narrow necks. Peridium of locules composed of small pale reddish yellow cells of textura oblita. Hamathecium of dense, hyaline, non-septate, unbranched, pseudo paraphyses. Asci 8-spored, bitunicate, cylindrical, with a short pedicel; apical chamber not observed. Ascospores 2-seriate, ellipsoid to fusiform, sometimes slightly curved, hyaline to pale yellow, 3-septate when mature, smooth to verrucose, with rounded ends. Asexual morph: Unknown (adapted from Dai et al. 2014).
Type species: Trematosphaeriopsis parmeliana Jacz. & Elenkin
Notes: Trematosphaeriopsis is characterised by solitary, scattered, superficial ascostromata, bitunicate, cylindrical, short pedicellate asci and ellipsoid to fusiform, hyaline to pale yellow, 3-septate ascospores. Trematosphaeriopsis resembles members of Trypetheliaceae in having globose, orange ascostromata developing on lichens (Lücking et al. 2007, Dai et al. 2014). Trematosphaeriopsis differs from Trypetheliaceae in having ascostromata with the cupped-socket area in centre and producing fusiform ascospores with 1−4 septa (Hafellner 2001). Dai et al. (2014) examined the isotype specimen of T. parmeliana (S F45300!) and referred Trematosphaeriopsis to Dothideomycetes, genera incertae sedis based on morphology. Wijayawardene et al. (2017, 2020) listed Trematosphaeriopsis in Dothideomycetes genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the systematic position of Trematosphaeriopsis.
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