A note on Armillaria mellea subsp. nipponica subsp. nov. in Japan

Abstract
Basidiomes of homothallic Armillaria mellea complex were discovered in the forests of Hokkaido, Their monosporous isolates showed partial compatibility with North American A. mellea s. str. haploid testers. The morphological characteristics of basidiomes differed from other temperate A. mellea s. str, in several aspects. Here, Japanese A. mellea s. str. is reclassified as A. mellea subsp. nipponica and its basidiome morphologies and habitats are described.