Mycosociology in native forests of Nothofagus of the X region of Chile, diversity and ecological role

A mycosociological and taxonomical comparative study of the Agaricales s.1 fruifing in Nothofagus forests from the Cordillera de la Costa, Depresion I ntermedia and the Cordillera de los Andes, X Region, Chile, was carried out . In the forests of Nothofagus the percentage of mycorrhizal species varies between 40.4% to 52.2% and the saprophytic between 47.8% to 69.4%. A large number of species belonging to Cortinarius were detected. In all the studi ed native forests, we found the following mycorrhizal species: Amanita diem ii, Cortinarius magellanicus Russula fuegiana and Tricholoma fusipes all as sociated to different Nothofagus species. The species of the genus Boletus and Stephanopus associated to Nothofagus dombeyi, N. oblique and N. alpina were only found in the native forests of the Cordillera de la Costa, while Amanita aurentiovelata and Russula nothofaginea associated to N. dombeyi an d N. oblique were found exclusively in the forests located in the Depresion Intermedia. In Nothofagus forests of the Cordillera de los Andes we did no t found any characteristic mycorrhizal Agaricales. No species of Lactarius were recorded in native forests, but in those with some kind df anthropic d isturbance or located near Pinus radiata plantations, we found the mycorrhi zal species Amanita rubescens Amanita muscaria Xeroccmis, rubellus, associa ted with N. obliqua, and Paxillus involutus, associated to Luma apiculata T he species of the genus Mycena dominate among the saprophytic Agaricales in all the Nothofagus forests.