Macrohilum
Macrohilum H.J. Swart, Trans. Br. mycol. Soc. 90(2): 288 (1988)
Diaporthomycetidae, Diaporthales, Macrohilaceae, Macrohilum
Index Fungorum number: IF11123; Facesoffungi number: FoF 02118; 1 morphological species; 1 species with sequence data.
Endophytic or saprobic on leaves of Myrtaceae (dicotyledons). Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata pycnidial, immersed, becoming erumpent, medium brown, globose to irregular. Conidiomata wall composed of pale brown-walled cells of textura globulosa. Conidiophores reduced to conidiogenous cells. Conidiogenous cells pale brown, cylindrical, percurrently proliferating at the apex with annellations. Conidia brown to dark brown, 1-septate, slightly constricted at the septum, apex rounded, base flattened with a protruding hilum (adapted from Maharachchikumbura et al. 2016b).
Type species: Macrohilum eucalypti H.J. Swart, Trans. Br. mycol. Soc. 90(2): 288 (1988)
Notes: The monotypic genus Macrohilum was introduced by Swart (1988a) with M. eucalypti, the type species. Macrohilum resembles coniothyrium-like taxa but is phylogenetically distinct as it has a protruding hilum (Crous et al. 2015a, Wijayawardene et al. 2016b). Furthermore, the four base pairs differences observed in their ITS sequences suggest that the New Zealand isolates may probably represent a novel Macrohilum species.
Swart (1988a) reported Macrohilum eucalypti from dead Eucalyptus leaves, while Crous et al. (2015a) isolated M. eucalypti from living leaves. However, neither Swart (1988a) nor Crous et al. (2015a) reported whether it caused leaf spots or any other symptoms. But, both of these publications did not carry out Koch's postulates to determine the pathogenicity of M. eucalypti. It would be appropriate to carry out more sampling from diseased Eucalyptus leaves and perform Koch’s postulates to determine whether Macrohilum species are pathogens as have been done for Colletotrichum species on Artocarpus heterophyllus (Bhunjun et al. 2019).
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