Calicium quercinum

{{Use dmy dates|date=October 2023}}

{{Short description|Species of lichen}}

{{one source|date=October 2023}}

{{Speciesbox

| image = Calicium quercinum.jpg

| status = G3

| status_system = TNC

| status_ref = {{cite NatureServe |id=2.121637 |title=Calicium quercinum |access-date=27 May 2025}}

| taxon = Calicium quercinum

| authority = Pers. (1797)

}}

Calicium quercinum is a species of lichen belonging to the family Caliciaceae.

It is native to Europe and North America.{{cite web |title=Calicium quercinum Pers. |url=https://www.gbif.org/species/2609287 |website=www.gbif.org |access-date=10 February 2021 |language=en}}