This checklist is based primarily on voucher specimens from Dick Harris' survey of Bartholomew's Cobble (1981-1982); the 2nd Tuckerman Lichen Workshop (1995); the 1998 and 2012 Andrews Forays; Phil May's survey of the summit of Mt Everett (1999); the 2010 and 2012 Berkshire BioBlitzes; and Scott LaGreca's survey of Windsor Jambs (2012). Nearly half of the vouchers used for this checklist were collected by Elisabeth Lay, mostly in the 1990s (now deposited at NY), which she graciously made available to us. Redetermined vouchers from Burnham's ''Lichens of the Berkshire Hills, Massachusetts'' (1918), deposited at CUP, provide a critical, historical component to this checklist. Almost all the voucher specimens used for this checklist are housed in the following herbaria: CUP, FH, MIN, MSC, NY, SRP, and the private herbaria of Robert Dirig and Scott LaGreca.