Polypores distributed in Japan are divided into 11 groups according to the distribution pattems as follows: 1) cosmopolitan species; 2) pantemperate species; 3) circumpolar temperate species; 4) Eurasian temperate species; 5) American-Asian temperate species; 6) East Asian temperate species; 7) endemic species in Japan; 8) East Asian-Southeast Asian mountainous species; 9) pantropical species; 10) paleotropical species; and 11) Asian tropical species. Perenniporia japonica belongs to the Eurasian temperate species group. Phellinus acontextus, Inonotus flavidus, I. scaurus, Loweporus pubertatis, etc. are East Asian temperate species. Phellinus setifer, P. macroferreus, P. velutinus and Inonotus boninensis are hitherto known only from Japan. Antrodiella aurantilaeta is proved to be distributed both in temperate East Asia and in a mountainous area in Southeast Asia. Of species distributed in mountainous areas of Southeast Asia, some are expected to be common to East Asian temperate areas, and others to be endemic.
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