Diaporthales » Apoharknessiaceae


Apoharknessia Crous & S.J. Lee, Stud. Mycol. 50(1): 239 (2004)

Diaporthomycetidae, Diaporthales, Apoharknessiaceae, Apoharknessia

Index Fungorum number: IF 500065; 3 morphological species (Species Fungorum 2020); 3 species with sequence data.


Endophytic or pathogenic on plants. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata pycnidial, stromatic, subepidermal, becoming erumpent, solitary to gregarious, subglobose or depressed globose or irregular, with irregular opening, unilocular, amphigenous. Conidiomata wall comprising cells of textura angularis. Conidiophores generally reduced to conidiogenous cells. Conidiogenous cells annellidic, ampulliform to subcylindrical or lageniform to ampulliform, hyaline, smooth, invested in mucus. Conidia broadly ellipsoidal or obovoid or obliquely gibbose, aseptate, pale brown to brown, with obtusely rounded apex, with or without a longitudinal band on the flat surface, thick- and smooth-walled, guttulate, with or without short hyaline apiculus, striations present or lacking. Basal appendage present or absent; when present, hyaline, tubular, thin- and smooth-walled. Apical appendage present or absent; when present, hyaline, tubular or conical, short, thin- and smooth-walled (adapted from Marin-Felix et al. 2019).


Type species: Apoharknessia insueta (B. Sutton) Crous & S.J. Lee, in Lee, Groenewald & Crous, Stud. Mycol. 50(1): 240 (2004)


Notes: Apoharknessia was established by Lee et al. (2004) to accommodate Harknessia insueta, and the latter constitutes a distinct phylogenetic lineage from Harknessia sensu stricto. Crous et al. (2017) introduced A. eucalyptorum as a second species. Marin-Felix et al. (2019) introduced a new species as A. eucalypti. This is a foliar pathogenic genus known from Brazil, Colombia, Cuba and Mauritius. Apoharknessia is similar to Harknessia but differs in generally having a hyaline, apical apiculus, and lacks prominent fluffy aerial mycelium in culture medium (Lee et al. 2004) (notes copied from Hyde et al. 2020).



Species illustrated in this entry

Apoharknessia insueta (B. Sutton) Crous & S.J. Lee




Crous PW, Wingfield MJ, Burgess TI, Hardy GE et al. 2017b – Fungal Planet description sheets: 558–624. Persoonia 38, 240–384

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020 – Refined families of Sordariomycetes. Mycosphere 11, 305–1059

Lee S, Groenewald JZ, Crous PW. 2004 – Phylogenetic reassessment of the coelomycete genus Harknessia and its teleomorph Wuestneia (Diaporthales), and the introduction of Apoharknessia gen. nov. Studies in Mycology 50, 235–252

Marin-Felix Y, Restrepo HM, Wingfield MJ, Akulov A et al. 2019 – Genera of phytopathogenic fungi: GOPHY 2. Studies in Mycology 92, 47–133



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