Seven Armillaria species identifi ed from Hokkaido Island, northern Japan

Sixty-two isolates from basidiocarps of Armillaria spp. were obtained from Hokkaido Island, northern Japan. Six species (Armillaria cepistipes, A. gallica, A. nabsnona, A. ostoyae, A. sinapina, and an undescribed species, “Nag. E”) were identifi ed by pairing tests with known tester strains and one subspecies (Armillaria mellea subsp. nipponica, a non-heterothallic form of A. mellea) was identifi ed by its macro and micro-morphological characters of the basidiocarps. This is the fi rst case of “Nag. E” being reported from Hokkaido Island.