Comment: This IS an Omphalina. Omphalina pyxidata is the conserved type of the genus Omphalina. See:
. Redhead, S.A., Lutzoni, F., Moncalvo, J.-M. & Vilgalys, R. (2002). Phylogeny of Agarics: Partial Systematics Solutions for Core Omphalinoid Genera in the Agaricales (Euagarics). Mycotaxon 83: 19-57.