Pleosporales » Pleosporales, genus incertae sedis

Pseudohendersonia

Pseudohendersonia Crous & M.E. Palm, Mycol. Res. 103(10): 1302 (1999).

Index Fungorum number: IF 28355; Facesoffungi number: FoF 01577, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Colonies associated with leaf spots. Mycelium internal, consisting of branched, septate, verruculose, medium brown hyphae. Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, solitary, black, subcuticular, becoming erumpent, globose to subglobose, unilocular, with a central ostiole; wall consisting of several layers of medium brown textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, lining the inner layer of the wall, covering the whole cavity, subcylindrical to cupulate, phialidic (sensu Sutton 1980), with successive conidia seceding at the same level, and very prominent periclinal thickening. Conidia holoblastic, solitary, dry, broadly ellipsoidal, light brown when immature, becoming dark brown at maturity, straight to slightly curved with a rounded apex and bluntly rounded base with an inconspicuous dehiscence scar, verruculose, (1–)3-distoseptate (adapted from Crous and Palm 1999).

 Type species: Pseudohendersonia proteae Crous & M.E. Palm

Notes: Pseudohendersonia is characterised by pycnidial, solitary, black conidiomata, hyaline, smooth conidiogenous cells and holoblastic, solitary, dry, broadly ellipsoidal conidia. Hendersonia was a nomen rejiciendum in favour of Stagonospora (Sutton 1977). Pseudohendersonia resembles Hendersonia in having pycnidial conidiomata and pigmented conidia produced from phialidic conidiogenous cells (sensu Sutton 1980) but differs in having verruculose, distoseptate conidia formed from hyaline conidiogenous cells with prominent periclinal thickening. Pseudohendersonia differs from Parahendersonia in that the latter has euseptate conidia while Pseudohendersonia has distoseptate conidia. Pseudohendersonia resembles Sonderhenia in having muriform conidia but the latter has slightly pigmented conidiogenous cells that proliferate per currently. Only LSU sequence is available for Pseudohendersonia in GenBank. Fresh collections and DNA sequence data are required to confirm the taxonomic placement of the genus.

 

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