Umbilicaria virginis
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Umbilicaria virginis, commonly known as the blushing rock tripe, is a species of saxicolous umbilicate lichen in the family Umbilicariaceae. It occurs in polar and alpine regions.
Umbilicaria virginis Flickr pellaea
Pruinescence
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Pruinescence, or pruinosity, is a "frosted" or dusty-looking coating on top of a surface. It may also be called a pruina, from the Latin word for hoarfrost. The adjectival form is pruinose.
Umbilicaria virginis
…a vernacular name used for the species is "blushing rock tripe". Umbilicaria virginis has a dark grey to brownish grey thallus that is dusted with pruina or a crystal-like substance, particularly around the umbo. It is typically 1.4–4 cm (0.55–1.57 in) in diameter, although sizes up to 10 cm (4 in) have…
A cicada displaying ventral pruinescence
Mature male common whitetail with pruinescence covering the abdomen
Pruina on plums
Characteristic pruina on cap of Collybia phyllophila