Foliose lichen (flattened like a leaf) with round to oval rosettes, divided at the circumference into rounded lobes. Upper surface yellowish green, greener when wet, covered with wrinkles and a powdery material (soredia-reproductive structures). Under surface (right below) black, brown at the edges, with black root-like rhizines. Inside cottony white, as seen at broken edges, below right.

Very common on tree bark in the Park; possibly the most common lichen present. May also occur on rocks.

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