Huhndorf et al. (2004) introduced this order for Chaetosphaeriaceae. Linocarpaceae was
added to Chaetosphaeriales by Konta et al. (2017) to accommodate Neolinocarpon and Linocarpon,
which are previously accepted in Xylariales, genera incertae sedis (Maharachchikumbura et al.
2015, 2016b). Konta et al. (2017) also established Leptosporellaceae to accommodate
Leptosporella, which was maintained in Chaetosphaeriales genera incertae sedis by
Maharachchikumbura et al. (2016b). Wijayawardene et al. (2018a) accepted Leptosporellaceae and
Linocarpaceae in Chaetosphaeriales and this is confirmed in our phylogenetic analysis (Figs. 1, 8).
The polyphyletic genus Diplococcium was previously excluded from Sordariomycetes and accepted
in Helotiales by Maharachchikumbura et al. (2015). Wijayawardene et al. (2018a) listed
Diplococcium in Helminthosphaeriaceae. However, a phylogenetic analysis by Hernández-Restrepo
et al. (2017) confirmed that Diplococcium is not related to Helminthosphaeriaceae and was placed
in Helotiales. Lin et al. (2019) introduced Multiguttulispora and placed it within
Chaetosphaeriaceae. Neoleptosporella (incertae sedis) will be added to the order by Phukhamsakda
et al. (2020). Chaetosphaeriales grouped sister to Tracyllalales with a low statistical support in our
phylogenetic analysis (Figs 1, 8). The divergence time for Chaetosphaeriales has been estimated as
158 MYA (Fig. 2). Here we accept four families and 59 genera in the order.