In the framework of study on wood inhabiting Hyphomycetes inChalus vicinity, Mazandaran (Iran), during 2005-2006, 21 taxa belonging to different genera were identified. Among them, nine taxa have already been recorded from Iran and the other taxa are new to Iran which are listed as follows: Arthrobotryum stilboideum, Chloridium preussi, C. virescens var. virescens, Codinaeopsis gonytrichoides, ...