Lichenopeltella
Lichenopeltella Höhn., Sber. Akad. Wiss. Wien, Math. - naturw. Kl., Abt. 1 128: 553 (1919).
Index Fungorum number: IF 2850; Facesoffungi number: FoF 06895, 48 morphological species (Species Fungorum 2022), no molecular data available.
Biotrophic on the upper surface of leaves, superficial mycelium present, with hyphopodia. Sexual morph: Thyriothecium superficial, flattened, coriaceous, opening by splitting or cracking to form a pore. Upper wall comprising rows of cells, radiating from the central opening to the periphery, base poorly developed. Hamathecium of asci and sparse pseudoparaphyses inclined towards the central ostiole. Asci 8-spored, bitunicate, broadly cylindrical, apedicellate. Ascospores overlapping 2–3-seriate, light-brown to hyaline, 2-celled, constricted at the septum, the upper cell larger than the lower cell, ovoid, the upper cell with rough walls, lower cell smooth-walled. Asexual morph: Unknown (adapted from Wu et al. 2014).
Type species: Lichenopeltella maculans (Zopf) Höhn.
Notes: Lichenopeltella is characterised by superficial, flattened, coriaceous thyriothecia, broadly cylindrical, apedicellate asci and light-brown to hyaline, two-celled ascospores. Müller and Arx (1962) and Arx and Müller (1975) referred Lichenopeltella to Leptopeltidaceae. Kirk et al. (2008) accepted Leptopeltidaceae in Microthyriales. Lichenopeltella resembles members of Microthyriaceae in having neatly arranged cells in the thyriothecium in a parallel fashion from the central ostiole but differs in its lichenicolous habit and the basal peridium which is well developed (Wu et al. 2014). Wu et al. (2014) examined the isotype specimen of L. maculans (K 158704) and suggested the placement of Lichenopeltella in Trichothyriaceae. Several authors studied Lichenopeltella and added new species to the genus (Höhnel 1919, Hawksworth & Santesson 1990, Spooner & Kirk 1990, Boom & Giralt 2012, Worobiec & Worobiec 2020). Lichenopeltella is morphologically a distinct genus in Trichothyriaceae. Fresh specimens with DNA sequence data are needed to confirm the taxonomic placement of Lichenopeltella and its relationship with other genera in Trichothyriaceae.
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