Lembosina
Lembosina Theiss., Annls mycol. 11(5): 437 (1913).
Index Fungorum number: IF 2728; Facesoffungi number: FoF 07696, 26 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on the upper surface of the stems, forming blackened circular areas. Superficial hyphae not observed. Sexual morph: Thyriothecia solitary, gregarious, superficial, easily removed from the host surface, black, opening with linear fissures when mature. Upper wall comprising a thin layer of mostly neatly arranged dark cells, which are branched at the outer rim, base poorly developed. Hamathecium comprising, sparse, filiform pseudoparaphyses. Asci 8-spored, bitunicate, subglobose to oblong, ocular chamber not observed, not staining blue in IKI. Ascospores overlapping 2–4-seriate, uniseptate, with an upper cell slightly wider and shorter than the lower, hyaline becoming brown with age. Asexual morph: Unknown (adapted from Hongsanan et al. 2014).
Type species: Lembosina aulographoides (E. Bommer, M. Rousseau & Sacc.) Theiss.
Notes: Arx and Müller (1975) treated Lembosina in Leptopeltidaceae based on its saprobic lifestyle and absence of appressoria and haustoria. Hawksworth et al. (1995) listed Lembosina as a member of Asterinaceae and this was followed by Lumbsch and Huhndorf (2010). Lembosina lacks appressoria, has a saprobic habit, hence was excluded from Asterinaceae and transferred to Aulographaceae (Hyde et al. 2013, Hongsanan et al. 2014). In the phylogenetic analysis of Crous et al. (2020), Lembosina clustered in a distinct clade sister to Lichenoconiales. Hence, Lembosina was accommodated in a new order Lembosinales and family Lembosinaceae. Molecular markers available for Lembosina include ITS, LSU, SSU, RPB2 and TEF-1.
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