Description:Soils from 78 sites in South Australia were examined for the natural occurrence of mycorrhiza fungi for Pinus radiata. These occurred in some 50% of soils not in close proximity to pine plantations, but were frequently sparse and of a poorly efficient type. It is suggested that naturally occurring mycorrhizal fungi for pine may frequently exist in association, not necessarily mycorrhizal, with Eucalyptus stands. There was a tendency for absence of mycorrhizal fungi from natural grasslands. Data on fungi causing mycorrhiza formation on Eucalyptus is assembled.