03259nas a2200145   4500008004100000022001400041245004800055210004800103300000900151490000700160520286000167100001903027700001603046856005103062       2019                        eng d  a0031-585000aFenestelloid clades of the Cucurbitariaceae0 aFenestelloid clades of the Cucurbitariaceae  a1-400 v443 a<p><jats p="">Fresh collections and their ascospore and conidial isolates backed up by type studies and molecular phylogenetic analyses of a multigene matrix of partial nuSSU-, complete ITS, partial LSU rDNA, <jats italic="">rpb2</jats>, <jats italic="">tef1</jats> and <jats italic="">tub2</jats> sequences were used to evaluate the boundaries and species composition of <jats italic="">Fenestella</jats> and related genera of the <jats italic="">Cucurbitariaceae</jats>. Eight species, of which five are new, are recognised in <jats italic="">Fenestella</jats> s.str., 13 in <jats italic="">Parafenestella</jats> with eight new species and two in the new genus <jats italic="">Synfenestella</jats> with one new species. <jats italic="">Cucurbitaria crataegi</jats> is combined in<jats italic=""> Fenestella</jats>, <jats italic="">C. sorbi</jats> in <jats italic="">Synfenestella</jats>, <jats italic="">Fenestella faberi</jats> and <jats italic="">Thyridium salicis</jats> in <jats italic="">Parafenestella</jats>. <jats italic="">Cucurbitaria subcaespitosa</jats> is distinct from <jats italic="">C. sorbi</jats> and combined in <jats italic="">Neocucurbitaria</jats>. <jats italic="">Fenestella minor</jats> is a synonym of <jats italic="">Valsa tetratrupha</jats>, which is combined in <jats italic="">Parafenestella</jats>. <jats italic="">Cucurbitaria marchica</jats> is synonymous with <jats italic="">Parafenestella salicis</jats>, <jats italic="">Fenestella bavarica</jats> with <jats italic="">S. sorbi</jats>, <jats italic="">F. macrospora</jats> with <jats italic="">F. media</jats>, and <jats italic="">P. mackenziei</jats> is synonymous with <jats italic="">P. faberi</jats>, and the latter is lectotypified. <jats italic="">Cucurbitaria sorbi</jats>, <jats italic=""> C. subcaespitosa </jats> and<jats italic=""> Fenestella macrospora</jats> are lecto- and epitypified, <jats italic="">Cucurbitaria crataegi</jats>, <jats italic="">Fenestella media</jats>, <jats italic="">F. minor</jats> and<jats italic=""> Valsa tetratrupha</jats> are epitypified in order to stabilise the names in their phylogenetic positions. A neotype is proposed for<jats italic=""> Thyridium salicis</jats>. A determinative key to species is given. Asexual morphs of fenestelloid fungi are phoma-like and do not differ from those of other representatives of the <jats italic="">Cucurbitariaceae</jats>. The phylogenetic structure of the fenestelloid clades is complex and can only be resolved at the species level by protein-coding genes, such as<jats italic=""> rpb2</jats>, <jats italic="">tef1</jats> and <jats italic="">tub2</jats>. All fungal species studied here occur, as far as has been possible to determine, on members of <jats italic="">Diaporthales</jats>, most frequently on asexual and sexual morphs of <jats italic="">Cytospora</jats>.</jats></p>
1 aJaklitsch, W M1 aVoglmayr, H  uhttp://dx.doi.org/10.3767/persoonia.2020.44.01