Lembosiniella
Lembosiniella Crous, in Crous et al., Stud. Mycol. 94: 187 (2019).
Index Fungorum number: IF 832019; Facesoffungi number: FoF 12258, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Pathogenic. Leaf spots amphigenous, dark brown to black, superficial, irregularly rounded. Sexual morph: Hysterothecia linear to rarely Y-shaped, superficial, amphigenous, black, opening by a central longitudinal slit. Pseudoparaphyses filiform, hyaline, simple or branched, septate. Asci broadly ellipsoidal to obclavate, bitunicate, 8-spored, sessile to short-stalked. Ascospores fusoid, hyaline to brown, medianly uniseptate, constricted, smooth to echinulate, guttulate. Asexual morph: Unknown (adapted from Crous et al. 2019).
Type species: Lembosiniella eucalyptorum Crous & Carnegie
Notes: Lembosiniella is characterised by linear to rarely Y-shaped, superficial, amphigenous hysterothecia, broadly ellipsoidal to obclavate, bitunicate asci and fusoid, hyaline to brown, medianlyuniseptate ascospores. Lembosiniella differs from Lembosina in being pathogenic causing brown leaf spots on Eucalyptus while Lembosina has saprobic lifestyle in Rhododendron (Crous et al. 2019). Lembosiniella also differs in that Lembosina has multi-layered ascal endotunica which does not occur in Lembosiniella. Both Lembosiniella and Lembosina have uniseptate fusoid-ellipsoid brown ascospores but those of Lembosina have a basal mucoid appendage while this is lacking in Lembosiniella. Crous et al. (2019) placed Lembosiniella in Dothideomycetes, genera incertae sedis since the ITS and LSU sequence did not match any sequence in GenBank. Further collections and research are needed to clarify the taxonomic placement of this genus. Molecular markers available for Lembosiniella include ITS and LSU.
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