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Xanthoria parietina: A Colorful Lichen

Xanthoria parietina, a foliose lichen, is known by several common names including common orange lichen, yellow scale, maritime sunburst lichen, orange lichen, and orange wall lichen. It is a visually striking lichen recognized for its vibrant colors and widespread distribution.

Considerations for Pets

• This lichen can grow on various surfaces, including rocks, concrete, and trees, sometimes near cattle farms. Consider this if your pets have access to these environments.

Considerations for Children

• The bright colors of this lichen may attract children's attention. It's often found on rocks, tombstones, concrete, and trees.
• Pigments from colorful lichens like Xanthoria parietina can be extracted by boiling and used to dye wool and other fibers. While not directly harmful, this could be a consideration if engaging in dyeing activities.

Taxonomy and Nomenclature

• Scientific Name: Xanthoria parietina
• Family: Teloschistaceae
• Xanthoria is a genus of lichenized fungi.

Distribution and Habitat

• Xanthoria parietina has a wide distribution and can be found in various locations.
• It grows on rocks, concrete, and trees, sometimes near cattle farms.
• It is also found on coastal rocks.

Morphological Characteristics

• It is a foliose (leafy) lichen forming large, rounded patches up to 10 cm across.
• It has wide, round-lipped marginal lobes.
• The thallus (body) is yellowish-green to golden-yellow or orange, but can appear grey in shaded areas.
• It lacks isidia or soredia.
• Apothecia (fruiting bodies) are usually present, with a dark orange disc surrounded by a lighter edge.

Ecological Role

• Orange lichens, including Xanthoria parietina, may identify hunting perches of birds and grow in profusion in seabird colonies.

Quirky Facts

• The orange color is due to the production of the pigment parietin.
• The pigment parietin, found in this lichen and rhubarb, may have potential as an anti-cancer drug.