Placopsis antarctica

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...