Based on DNA sequences of ITS and rpb2, Amylostereum orientale is reported for the first time in Japan

Amylostereum laevigatum has been reported from Japan growing on Cryptomeria japonica and Chamaecyparis obtusa. Using morphological and molecular data (internal transcribed spacer (ITS) nrDNA and rpb2 markers), we demonstrate that some specimens under A. laevigatum from Japan belong to A. orientale, a species described from China. Amylostereum orientale differs from A. laevigatum mainly in having smaller basidiospores. This is the first citation of A. orientale in Japan.