White Rim Lichen

Glaucomaria rupicola, the white rim lichen, is a species of crustose lichen in the family Lecanoraceae. It forms thick, whitish-grey patches on hard, exposed siliceous rock such as granite, from coastal cliffs to mountain summits. The fruiting bodies are typically covered by a conspicuous pale grey powdery coating, and the disc reacts bright yellow with bleach (the C spot test). The species has a wide distribution, occurring across Europe, North America, and Asia in the Northern Hemisphere, and extending into South America and other southern regions. It is particularly common on wave-splashed rocks just above the high-tide line and on well-lit rock outcrops inland.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of White Rim Lichen being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

• Aspicilia cinerea
• Diploschistes actinostomus
• Circinaria calcarea
• Ochrolechia parella
• Lepra corallina
• Xalocoa ocellata

Classification

Kingdom

Fungi

Phylum

Ascomycota

Class

Lecanoromycetes

Order

Lecanorales

Family

Lecanoraceae

Genus

Lecanora

Species

Lecanora rupicola

More species