Thedgonia ligustrina
Anamorph: colonies circular, less frequently irregular, rarely exceeding 1 mm diam., sometimes confluent, appearing zonate with a central region of greyish brown tissue, the periphery medium brown and often with a dark purplish brown raised border. Sporulation hypophyllous, very rarely epiphyllous, sometimes in concentric zones, salmon-pink. Mycelium immersed, composed of branched, septate, hyaline to subhyaline hyphae 2-3 µm diam., forming substomatal, epidermal to subepidermal stromata to 50 µm diam. Conidiophores 23-55 x 4-6 µm, cylindrical, not synnematous, in compact or divergent clusters, straight or flexuous, branched and occasionally 1-septate at the base, smooth, thin-walled, hyaline. Conidiogenous cells terminal, not clearly distinguished from the conidiogenous cells, hyaline, thin-walled, proliferating sympodially, with 1-3 wide flat unthickened scars 2.5-3.5 µm diam. in the upper part. Conidia formed in short dry chains comprised of 2-3 conidia, 25.5-63 x 4-5·5 µm, cylindrical, straight, thin-walled, 0- to 3-septate, hyaline, intercalary conidia truncate at each end, apical conidia truncate at the base, obtuse at the apex, without a gelatinous sheath or appendages.
Teleomorph: not known.
Not formally assessed. Appparently common, and would be likely to be considered as of Least Concern.
Forming spots on living leaves of Ligustrum vulgare, and also on the garden ornamental (and frequent escapee) L. ovalifolium.
Recorded throughout England from Cornwall to Durham and with a few Welsh reports - bu apparently absent from Scotland.