Pseudoleptosphaeria
Pseudoleptosphaeria Ariyaw. & K.D. Hyde, in Ariyawansa et al., Fungal Diversity: 10.1007/s13225-015-0349-2, [24] (2015).
Index Fungorum number: IF 551469; Facesoffungi number: FoF 08262, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Parasitic on bark of gall on trunk of Populus tremuloides. Sexual morph: Unknown. Asexual morph: Conidiomata immersed to superficial, solitary to gregarious, globose to pear-shaped, dark brown to black, pseudoparenchymatous, covered to varying degrees by hyaline to dark colored hyphae. Conidiogenous cells phialidic, hyaline, globose to flask-shaped. Conidia enteroblastic, ellipsoidal to ovoid to oblong, hyaline, smooth-walled, unicellular (adapted from Ariyawansa et al. 2015).
Type species: Pseudoleptosphaeria etheridgei (L.J. Hutchison & Y. Hirats.) Ariyawansa & K.D. Hyde
Notes: Pseudoleptosphaeria is characterised by immersed to superficial conidiomata, phialidic, hyaline, globose to flask-shaped conidiogenous cells, and enteroblastic, ellipsoidal to ovoid to oblong conidia. De Gruyter et al. (2013) accommodated Phoma rubefaciens and Phoma etheridgei in Leptosphaeria. In the phylogenetic analysis of Alves et al. (2013) and Ariyawansa et al. (2015), Phoma etheridgei formed an independent lineage distant from all other genera hence, it was accommodated in the new genus Pseudoleptosphaeria. The latter is closely related to Neoleptosphaeria but differs in that the latter has scleroplectenchyma conidiomatal wall, guttulate ascospores and occur on Malus spp. while the former has pseudoparenchymatous wall, and is found on Populus tremuloides. Pseudoleptosphaeria is a distinct and well-defined genus in Leptosphaeriaceae. Molecular markers available for Pseudoleptosphaeria are ITS and LSU.
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