Timothy Flynn; O. K. Miller (1990). "Biosystematics of Agrocybe molesta and sibling species allied to Agrocybe praecox in North America and Europe". Mycological Research. 94 (8): 1103–1110. doi:10.1016/s0953-7562(09)81341-5. A synopsis is available online at the Science direct site.
Timothy Flynn; O. K. Miller (1990). "Biosystematics of Agrocybe molesta and sibling species allied to Agrocybe praecox in North America and Europe". Mycological Research. 94 (8): 1103–1110. doi:10.1016/s0953-7562(09)81341-5. A synopsis is available online at the Science direct site.
speciesfungorum.org
For instance, search Species Fungorum with genus name = "Agrocybe" to find the related species. A. praecox is here.
This page of Species Fungorum shows synonyms of A. praecox.