New species, combinations and records of Thyronectria, with a key to species

Abstract The new species Thyronectria ulmi is described from Ulmus laevis and U. minor collected in Austria, the Czech Republic Slovakia. It morphologically phylogenetically close to North American T. chrysogramma , which also occurs on shares olive green brown muriform ascospores, but differs latter by geographic distribution, narrower asci, smaller ascospores with fewer septa DNA sequence data seven loci (ITS LSU regions of nu rDNA, ACT1 RPB1 RPB2 TEF1 TUB2 genes). As many other species, ascomata were closely associated Diplodia indicating a fungicolous habit. genus Neothyronectria synonymised based morphological molecular phylogenetic data, combinations citri sophorae are proposed. A key 45 accepted provided. recently abieticola previously known France, newly reported Austria Slovakia; its pycnidial anamorph recorded, illustrated natural substrates for first time. sporodochial aurigera record as well. New host distribution records include rhodochlora Acer pseudoplatanus Fraxinus excelsior Republic, sinopica Hedera colchica Bupleurum fruticosum Spain, zanthoxyli Sorbus aucuparia Belgium sp. USA. cucurbitula confirmed Pinus strobus challenging ranges given ( subgen. ) strobi Strobus ), questioning European Chinese .