Black Stone Flower

Parmotrema perlatum, commonly known as the powdered ruffle lichen, is a common species of foliose lichen in the family Parmeliaceae. The species has a cosmopolitan distribution and occurs throughout the Northern and Southern Hemispheres. Parmotrema perlatum is a prominent and widely recognised species within its genus across primarily temperate zones, preferring humid, oceanic-suboceanic habitats. It is found in diverse geographic areas including Africa, North and South America, Asia, Australasia, Europe, and islands in the Atlantic and Pacific oceans. It usually grows on bark, but occasionally occurs on siliceous rocks, often among mosses.

The thallus of Parmotrema perlatum is large, light-grey to pale-blue patch-shaped with rounded and ruffled lobes and often with black hair-cilia at the edges. Distinguishing features of the lichen include its conspicuous soralia (reproductive structures) near the lobe edges, curled leaf-like lobes, and a narrow, shiny, and sometimes wrinkly area on the underside near the margin.

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