Habitat and Substrate: Open to shaded areas, on trees and rocks, often among mosses.

Rhode Island Status: Very common.

Pollution Tolerance: Tolerant.

Collection Site(s): Crandall Swamp, Westerly (#4853, #4854); Beaver River, Richmond (#4900); Great Swamp Area, South Kingstown (#4950); Tuckerman Park, South Kingstown (#4964); Factory Pond, South Kingstown (#4984); Queen River, Exeter (#5020); Ell Pond, Hopkinton (#5043); Ponagansett Public Fishing Area, Foster (#5061); Casimir Pulaski Memorial Park, Glocester (#5067); Sprague Farm, Glocester (#5091); Headwaters of Wood River, West Greenwich (#5139); Snake Den State Park, Johnston (#5176); Buck Hill Wildlife Management Area, Burrillville (#5234); Scituate Reservoir, Scituate (#5252); Blue Pond, Hopkinton (#5331); Nicholas Farm, Coventry (#5354); Norman Bird Sanctuary, Middletown (#5379); J.L. Curran Park, Cranston (#5415); Frenchtown Park, East Greenwich (#5428); Black Swamp Area, North Kingstown (#5504); Kimball Wildlife Sanctuary, Charlestown (#5571); George Parker Woodlands, Coventry (#5587).

Notes: Previously reported in Rhode Island by Flenniken (1968b) and Hinds (1998). Early records (Bennett [1888] and Hebert [Flenniken 1968a]) of Parmelia saxatilis may be Parmelia squarrosa.