1st March 1812:  Various species of lichen: inelegant hollow-shielded lichen (top), wrinkled hollow-shielded lichen (centre) and yellow candle lichen (bottom).  (Photo by Hulton Archive/Getty Images)

1st March 1812: Various species of lichen: inelegant hollow-shielded lichen (top), wrinkled hollow-shielded lichen (centre) and yellow candle lichen (bottom). (Photo by Hulton Archive/Getty Images)

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