USA, Michigan, Washtenaw, Woods north of Ann Arbor.
[There is no field book entry for this collection as Collybia hygrophoroides. It is possible there is a card filed as "Mycena 3221" that might match this collection. See also MICH-273179. 273179 may be part of this collection that was sent to M. Moser in the 1940s. Additional information can be found in the notes of MICH-273179 - R. A. Powers (Jan 2015)]