A squamulose lichen is a lichen that is composed of small, often overlapping "scales" called squamules. If they are raised from the substrate and appear leafy, the lichen may appear to be a foliose lichen, but the underside does not have a "skin" (cortex), as foliose lichens do.  Squamulose lichens are composed of flattish units that are usually tightly clustered. They are like an intermediate between crustose and foliose lichens.
- Dobson, F.S. (2011). Lichens, an illustrated guide to the British and Irish species. Slough, England: Richmond Publishing Co. Ltd. ISBN 9780855463151.
- "FAQs". Images of British Lichens. Retrieved 3 April 2020. CS1 maint: discouraged parameter (link)