Abstract
Six basidiomycetous fungi were isolated from sugi（ Cryptomeria japonica D. Don） stakes which were treated with copper-preservative and exposed at the field more than 13 years.Copper sulfate-treated sugi blocks were cultivated with these fungi for 12 weeks. After the fungal attack by Asuka N and Asuka J, 24％ and 51％ of the original copper was removed from the specimens although 8～18％ was by the others. And dark green substances were found at the surface of the specimens attacked by Asuka N and Asuka J. These results showed that Asuka N and Asuka J transferred a part of the copper from the inside of the specimen to the outside. These fungal transfer of copper might give the effect to the service life of stakes treated with copper-preservative.
