Heterospora chenopodii (Westend.) Gruyter et al., Stud. Mycol. 75: 18 (2012)
Basionym:Phyllosticta chenopodii Westend., Bull. Acad. Roy. Sci. Belgique Ser. 2, 2: 567. 1857; not Phyllosticta chenopodiiSacc., Syll. Fung. 3: 55. 1884
Saprobic or pathogenic on stems and leaves of herbaceous or woody plants in terrestrial habitats.Sexual morph: undetermined. Asexual morph:Coelomycetous. Conidiomata100–550 μm wide, pycnidial, immersed to semi-immersed, globose to subglobose, black with one or two distinct ostiole.Ostiole sometimes papillate or with elongated neck.Conidiomata wall 15–60 μmwide, composed of 3–5 layers of cells of textura angularis, pale yellowish brown. Conidiogenous cells4–8 × 4–6 μm phialidic, subglobose to short conical. Conidia4–7 × 1–3 μm, hyaline, aseptate, oblong to ellipsoidal with two to many guttules (van der Aa and van Kesteren 1979).
Notes: Initially Heterospora was treated as a section of Phoma by Boerema (1997), and was raised to generic rank by De Gruyter et al. (2013) to accommodate two species of Phoma sect. Heterospora that cluster in the Leptosphaeriaceae, i.e.H. chenopodii and H. dimorphospora.All other species of Phoma sect.Heterospora clustered in the family Didymellaceae (Aveskamp et al. 2010). Heterospora is closely related to Subplenodomus and no sexual morph is known for this genus (De Gruyter et al. 2013).
Fig .Heterospora chenopodii (redrawn from Phoma chenopodiicola in De Gruyter et al. 1993, Fig 25.). Scale bars: 10 µm.