In North America, it is particularly abundant in the Great Lakes region and Maritime provinces of Canada, where it commonly grows as an epiphyte on tree bases in swampy areas.

The discovery of previously unreported chemical compounds in the holotype of L. frigida provided additional evidence supporting the merger of these two taxa.

Environmental conditions significantly influence its appearance, with specimens in more exposed locations typically displaying more clearly defined margins and paler colouration compared to those in sheltered positions.

[4] Lepraria eburnea is widely distributed across northern North America, being particularly abundant in the Great Lakes region and Maritime provinces of Canada.

In these regions, it is frequently found growing as an epiphyte at tree bases in swampy areas, showing a particular preference for Thuja species.

The species is also present in the Pacific Northwest, with isolated populations occurring southward in various mountain ranges of western North America.