Diaporthales » Melanconidaceae


Melanconis Tul. & C. Tul., Select. fung. carpol. (Paris) 2: 115 (1863)

Diaporthomycetidae, Diaporthales, Melanconidaceae, Melanconis

Index Fungorum number: IF3060; Facesoffungi number: FoF 02119; 36 morphological species (Species Fungorum 2020), 8 species with sequence data.

Saprobic or pathogenic on plants and wood, in terrestrial and aquatic habitats. Sexual morph: Pseudostromata well-developed, obvious, erumpent. Ectostromatic disc surrounded by bark or not, yellowish-white. Ostiolar canal opening around the disc. Ascomata arranged as circles around the ectostromatic disc, oblique or horizontal, globose to subglobose, coriaceous and black with long, periphysate and lateral ostiolar canals. Peridium with outer, thick-walled, brown cells of textura globosa to textura angularis and inner, thick-walled, flat, hyaline cells of textura angularis. Paraphyses wide, hypha-like, deliquescent at maturity. Asci 8-spored, unitunicate, oblong to fusiform, short pedicellate, with distinct, J-, apical ring. Ascospores overlapping uniseriate to biseriate, hyaline, ellipsoid, 1-septate. Asexual morph: Coelomycetous. melanconium-like. Conidiomata acervular, scattered, solitary, superficial, black, coriaceous. Conidiophores branched at the base, septate, Conidiogenous cells annellidic, cylindrical. Conidia hyaline to brown, ellipsoid or subglobose, smooth-walled, thick-walled (adapted from Senanayake et al. 2017a).


Type species: Melanconis stilbostoma (Fr.) Tul. & C. Tul., Select. fung. carpol. (Paris) 2: 115 (1863)


Notes: The genus comprises saprobic, pathogenic (Senanayake et al. 2018) and endophytic (Barengo et al. 2000) species associated with the hardwood of plants in Betulaceae (Fan et al. 2016). The genus is characterised by ascomata with 8-spored asci, ellipsoid, 1-septate ascospores, and acervular conidiomata with hyaline to brown, ellipsoid or subglobose conidia. Most of the species are known in North America and Europe (Senanayake et al. 2017a).




Melanconis betulae C.M. Tian & X.L. Fan, in Fan, Du, Liang & Tian


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