CONICET | Buscador de Institutos y Recursos Humanos

Wood-rotting Aphyllophorales (Basidiomycotlna) on standing Austrocedrus chilensis. The frequency of Aphyllophoraceous fungi decaying the butt of standing Austrocedrus chilensisin Southern ArgentinawasInvestigated,andthe typesof rotproducedby themwere established. A totalof 151trees, partiallyortotallyaffectedbythediseaselocallyknownasmaldelcipréswerefelledinfivestandslocated along the Patagonian Andes In Chubut and Rio Negro provinces (Argentina). The presence, type and position of wood-rots foundat the stemsbutt were annotated,andisolations were performedInorder to identify the fungal agents. Postia dissecta and Coniophora arida cause.d a brown rot of the sapwood, present as columns or circular sectors of decayed wood (83.3% of the isolations from the sapwood). Poiyporusmelanopuscaused awhitefibrilarrot inthesapwood(3.8%oftheisolationsfromthesapwood). An unidentified Hymenochaetaceae was responsible of centric or excentric columns of a white fibrilar wood-rot in the hardwood (90.8% of the isolations in the hardwood). This rot also exhibited the macroscopical aspect of a brown rot. Field observations showed that this white fibrilar wood-rot can be present alongall the stemof the tree. Perenniporiaaff. medullapaniswas infrequently isolated from the hardwood. Several other fungi were responsible for a type of rot named splinter-like, which was characterizedbyproducinganIrregular surface onthe cut wood,though the quality,strengthandcolors of the affected tissues were not altered. This type of rot was infrequently present either in the.sapwood or in the hardwood and the Isolated fungi included Sistotrema brinkmanii, aff.Radulomyces confiuens and three unidentified Basidiomycetes (I,IIandIII). A key and the cultural features of allthe isolatedspecies are presented. All the species are new records on A. chilensis.

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