"Muddy Pond" is a problematic location. Faxon has a number of specimens from this "location" on this date, including some having it in Massachusetts in Milton. Catalog #: F225416 Occurrence ID: S:S-Fungi:F225416 Taxon: Umbilicaria mammulata (Ach.) Tuck. Family: Umbilicariaceae Collector: E. Faxon Date: 1882-03-20 Verbatim Date: 1882-03-20 Locality: United States, Massachusetts, Muddy Pond, Milton, Mass. Notes: Ex-Herb. W. G. Farlow. there is a viewable label that includes Milton, but I cant lay my mouse pointer on it at the moment.