CHANGBAI WOOD-ROTTING FUNGI .2. POSTIA-AMYLOCYSTIS (BASIDIOMYCETES), A NEW POLYPORE SPECIES

A new polypore species, Postia amylocystsis Y.C. Dai & Renvall, is des cribed, based on recent collections from the Changbai Mountain Range i n northeastern China. The species is evidently a saprotroph that cause s brown rot on fallen, decorticated trunks of deciduous trees. Thick-w alled, hymenial cystidia and very narrow, allantoid spores are key cha racters, distinguishing it from other species in the genus Postia Fr. Amyloid reactions in the cystidia and in the uppermost contextual hyph ae suggest a possible phylogenetic relationship to Amylocystis lapponi ca (Romell) Singer, and cast doubt on the separation of the genus Amyl ocystis Singer from Postia.