Phlebia crassisubiculata is a species of crust fungus that is found in India. It was described as new to science in 2010. The type specimen was found growing on the underside of a decaying stump of gymnospermous wood in the Dalhousie hills of Himachal Pradesh. The specific epithet crassisubiculata refers to the "conspicuously thick subiculum" that is characteristic of the species.