Hydropus sp.

 This mushroom microscopically resembles to Hyropus atrialbus(ヒロヒダタケモドキ).

  Basidia have two spores.  Macroscopically, different from H. atrialbus, lammella  not decurrent but rather adnexed.

  The mushroom grows from ground and not from wood.

Spore : 8-10(13) x 7-8 mm      weak amyloid     Pileipellis
    Cheilocystidia   Caulocystidia