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Clitocybe sp.
Hundreds of species of mushrooms compose the fungus genus Clitocybe. They are characterized by white, off-white, buff, cream, pink, or light-yellow spores, gills running down the stem, and pale white to brown or lilac coloration. They are primarily saprotrophic, decomposing forest ground litter. There are estimated to be around 300 species in the widespread genus. Infundibulicybe gibba is a hardwood-loving clitocyboid mushroom that features a pinkish tan cap that becomes fairly deeply vase-shaped by maturity. Its pale, crowded gills run down the stem, which is pale in comparison to the cap. Other distinctive features include the white mycelium on the stem base and, usually, a faintly sweet odor.
leaf litter in a forest in mountainous Japan.
Clitocybe is a difficult genus, you probably aren't going to have a correct name if you're going to apply European names to Japan without a very good reason.