Diaporthomycetidae Senan., Maharachch. & K.D. Hyde, subclass novusIndex Fungorum number: IF 551051

Pathogenic, parasitic, endophytic, or saprobic, associated with plants or pathogens of insects, animals or humans.
Sexual morph: Stromata immersed to erumpent, composed of orange, brown or black parenchymatous tissues, ascomata embedded in stromatic tissues. Ascomata solitary or aggregated, immersed, erumpent to superficial, globose to subglobose, rarely pyriform, sometimes carbonaceous, brown to black. Asci 8 or multi-spored, unitunicate, cylindrical, clavate to oblong, with a nonamyloid refractive apical apparatus. Ascospores 2–3-seriate, variously shaped, aseptate or septate, sometimes with appendages and sheaths. Asexual morph: ceolomycetous or hypomyceteous, when coelomycetous. Conidiomata acervuli or pycnidial. Conidiogenous cells phialidic or annellidic. Conidia small to large, unicellular to multiseptate, hyaline, light brown to dark brown when hypomyceteous, Conidiophores arising from hyphae. Conidiogenous cells terminal or lateral, sometimes coloured, mostly hyaline. Conidia mostly unicellular, oval, hyaline.

Type order: Diaporthales Nannf.

Notes: The subclass Diaporthomycetidae was introduced by Maharachchikumbura et al. (2015) for some taxa already placed in Sordariomycetidae, but that were phylogenetically and morphologically distinct from Sordariomycetidae. Members of Diaporthomycetidae occur in both aquatic and terrestrial habitats as saprobes, pathogens, or endophytes. Previously there were ten orders in this subclass (Hongsanan et al. 2017). Crous et al. (2017a) introduced Pararamichloridiales and Crous et al. (2019a) introduced Sporidesmiales. Hyde et al. (2017a) proposed Catabotryales based on evolutionary data and here we formally introduce it. Currently, there are 15 orders and 65 families in this subclass (Hyde et al. 2017a, this paper). The divergence time for Diaporthomycetidae is estimated as 247 MYA. The orders and families in this subclass are mostly well-supported in our phylogenetic analysis.

Type species: Diaporthe eres Nitschke

References

Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC, Huang SK, Abdel-Wahab MA, Daranagama DA, Dayarathne M, D’souza MJ, Goonasekara ID, Hongsanan S, Jayawardena RS, Kirk PM, Konta S, Liu JK, Liu ZY, Norphanphoun C, Pang KL, Perera RH, Senanayake IC., Shang Q, Shenoy BD, Xiao Y, Bahkali AH, Kang J, Somrothipol S, Suetrong S, Wen T, Xu J (2015) Towards a natural classification and backbone tree for Sordariomycetes. Fungal Diversity 72: 199–301.