title: Ophiostoma arduennense sp. nov. (Ophiostomatales, Ascomycota) from Fagus sylvatica in southern Belgium.
abstract: Ophiostoma arduennense sp. nov. is described from several cultures isolated from Fagus sylvatica in southern Belgium. The species is mainly characterized by globose perithecia with small button-like bases ornamented with brown hyphal hairs of variable length and, long cylindrical necks ending in ostiolate hyphae. It is homothallic with small reniform ascospores and no apparent anamorph. It is closely associated with the ambrosia beetles Xyloterus domesticus and X. signatus. Its phylogenetic relationships within Ophiostoma are discussed and the species is compared with other Ophiostoma species associated with European beech or other broad-leaved trees in Europe, especially species of the O. quercus-O. piceae complex. The species is responsible for a dark brown staining of the sapwood and its role in the decline of beech in Southern Belgium is also discussed.
authors.affiliation: Université catholique de Louvain, Unité de Phytopathologie (FYMY), Croix du Sud 2/3, B-1348 Louvain-la-Neuve, Belgium.
authors.forename: François-Xavier
authors.initials: FX
authors.lastname: Carlier
authors.forename: Cony
authors.initials: C
authors.lastname: Decock
authors.forename: Karin
authors.initials: K
authors.lastname: Jacobs
authors.forename: Henri
authors.initials: H
authors.lastname: Maraite
mesh_terms: D000818:Animals; D001203:Ascomycota / Q000145:classification* / Q000166:cytology / Q000254:growth & development / Q000302:isolation & purification*; D001530:Belgium; D001517:Coleoptera / Q000382:microbiology; D004271:DNA, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D017753:Ecosystem; D029964:Fagus / Q000382:microbiology*; D010802:Phylogeny; D010935:Plant Diseases / Q000382:microbiology; D040102:Tetranychidae / Q000382:microbiology
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal