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Parmelia saxatilis

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description Parmelia saxatilis Overview

Parmelia saxatilis is a foliose lichen commonly known as crottle or salted shield lichen. It has gray, leaf-like lobes with a network of raised ridges and often grows attached to rocks, tree bark, and other exposed surfaces. The species has been used historically as a source of lichen dye, especially in parts of Britain and Ireland, although the resulting color depends on preparation and the material collected.

help Parmelia saxatilis FAQ

What does Parmelia saxatilis look like?

Parmelia saxatilis has gray, leaf-like lobes marked by a network of raised ridges. It is commonly called crottle or salted shield lichen because of this textured shield-like appearance.

Where does Parmelia saxatilis grow?

It can grow attached to rocks, tree bark, and other exposed surfaces. Unlike a soil-dwelling Cladonia, Parmelia saxatilis usually forms a foliose thallus directly over its supporting surface.

Why is Parmelia saxatilis called crottle?

Crottle is a traditional common name for Parmelia saxatilis and related dye lichens. The species was historically used as a source of lichen dyes, especially for producing earthy colors in textiles.

Is Parmelia saxatilis a foliose lichen?

Yes, Parmelia saxatilis is foliose, meaning it has leaf-like lobes. Its gray ridged surface and attachment to rock or bark separate it visually from crustose lichens and from branched fruticose species.

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