From the Vault: Night of the Lichen-thropes
Stuff To Blow Your Mind
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When Did Lichens Emerge?
Fossil record of lichen is not all that compelling. Most lichen dominated habitats such as tundras, deserts, mountain tops don't produce a lot of fossils. Some fossils from between two point two and two point seven billion years ago have been interpreted by some as being liconized organisms.
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