Lembosiella
Lembosiella Sacc., Syll. fung. (Abellini) 9: 1101 (1891).
Index Fungorum number: IF 2726; Facesoffungi number: FoF 07948, 1 morphological species (Species Fungorum 2022), no molecular data available.
Foliar epiphyte on the upper surface of leaves, superficial mycelium present, sparse, hyphopodia absent. Sexual morph: Thyriothecia globose, ellipsoidal, or cylindrical, gregarious or some solitary, superficial, membranaceous, black-brown, lacking a well-developed basal peridium, opening by a longitudinal split, easily separated from the host; in section lenticular. Upper wall comprising parallel radiating lines of ellipsoid cells from the central ostiole to the outer rim. Peridium a single stratum composed of black-brown pseudoparenchymatous cells of compact textura angularis. Hamathecium of sparse asci, embedded in mucilage inclined towards the center, pseudoparaphyses not observed. Asci 8-spored, bitunicate, fissitunicate, spherical, broadly oblong, sessile. Ascospores rounded at the ends, at first hyaline and then brown when mature, two-celled, slightly constricted at septa with the upper cell wider than lower cell, guttulate, smooth walled. Asexual morph: Unknown (adapted from Wu et al. 2011).
Type species: Lembosiella polyspora (Pat.) Sacc.
Notes: Lembosiella is characterised by globose, ellipsoidal, or cylindrical thyriothecia, spherical, broadly oblong, sessile asci and hyaline to brown, two-celled ascospores. Lembosiella resembles Lembosia in Asterinaceae, but can be differentiated based on the superficial hyphae with intercalary or lateral hyphopodia (Arx & Müller 1975). Lumbsch and Huhndorf (2010) treated Lembosiella as a distinct genus in Microthyriaceae. Wu et al. (2011) re-examined the type specimen of L. polyspora (PC 0084466) and transferred Lembosiella to Aulographaceae based on superficial hyphae lacking hyphopodia and elongate ascomata opening by a longitudinal split, spherical bitunicate asci and two-celled, light brown mature ascospores. Molecular data is lacking for Lembosiella hence fresh collections are needed to confirm the correct taxonomic placement of the genus.
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