| Abstrakt: |
Neonectria(Hypocreales: Nectriaceae) species having Cylindrocarponanamorphs that lack microconidia and chlamydospores include: Neo. discophoravar. discophora, Neo. discophoravar. rubi, stat nov. et comb. nov., Neo. lucida, comb. nov., Neo. viridispora, sp. nov. and Neo. westlandica, comb. nov. Perithecia of these species are red and perithecial anatomyis of the N. mammoidea type, with a palisade of hypha-like cells in the outer perithecial wall. These species occur on recently dead or dying trees. Perithecia of Neo. betulae, sp. nov and Neo. dumontii, sp. nov. are anatomically and biologically similar to those of Neo. discophora.The only known culture of Neo. betulaeremained sterile, while Neo. dumontiihas not been cultured; their anamorphs are presumed to be Cylindrocarpon.Analyses of mit ssu rDNA sequences indicate that Neonectria/Cylindrocarponis monophyletic. Within the genus, species having N. mammoidea type perithecia are paraphyletic. Most species cluster with Neo. discophora,but Neo. westlandicaand Neo. trachosaare basal to a clade that includes species that do not have a N. mammoidea-type perithecium. Nectria fuckelianaclusters independently of Neonectriaand Nectria.Although reported to have a Cylindrocarponanamorph, fresh ascospore isolates of N. fuckelianadid not produce Cylindrocarponmacroconidia but produced acremonium- or verticillium-like anamorphs. A key to nectriaceous species of Neonectriathat have Cylindrocarponanamorphs that lack microconidia and chlamydospores and/or that have a N. mammoidea type perithecial wall anatomy is presented. New combinations are proposed for other species formerly included in Nectriathat have non-microconidial Cylindrocarponanamorphs: Neonectria cinnamomea, Neo. jungneri, Neo. platycephala, Neo. phaeodiscaand Neo. verrucospora. |
