The morphology and nomenclature of the characteristic, probably monotypic, stilbellaceous hyphomycete genus Tilachlidium Preuss has been dealt with by Petch (1937) and Gams (1971: 141). A perfect state was then unknown. Colonies of the fungus in vitro are rather similar to those of Nectria viridescens Booth. The conidial state has now been found in nature connected with a hypocreaceous (nectriaceous) perfect state.