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Orange-cored Shadow lichen (Phaeophyscia rubropulchra) on a tree trunk

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The photo shows a rosette-shaped lichen with olive-green leaves (lobes) growing on a dark tree trunk. The narrow, branched, long lobes are closely connected to the tree trunk and attached with short, black 'hairs' (rhizines) that are visible on the underside of the lobes. Some of the lobe tips are broken off, and an orange-coloured core can be seen inside the lobes, which is an unusual inner colour for lichens! In most cases, this inner part of the lobes, called the medulla, is white. This lichen, the Orange-cored Shadow lichen (Phaeophyscia rubropulchra), is surrounded by a brown liverwort, some moss and some snow.
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