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Placopsis antarctica

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Placopsis antarctica is a species of crustose lichen in the family Trapeliaceae. It is found only in Antarctica, where it forms pale-coloured, circular patches on rock surfaces, typically .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1–3 cm (3⁄8–1+3⁄16 in) across, with distinctive finger-like projections that break down into powdery structures. The lichen contains both green algae and blue-green algae (cyanobacteria) as partners, allowing it to both photosynthesise and convert nitrogen from the air into a form that can be used by other organisms. These circular patches can occasionally grow up to 6 cm (2+3⁄8 in) in diameter, with edges that show neat, fan-like folds and can appear either swollen or slightly flattened.