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Large crusty fungus which must grow quite quickly since it has engulfed fallen twigs and leaves. If it is a Corticioid (or "Crust") Fungus, then this would be the fruiting body, with the fungus plant inside the wood. https://en.wikipedia.org/wiki/Corticioid....
Huasteca Forest, Edward James Surrealism Park, Xilitla, San Luis Potosí.
Spotted on Apr 17, 2015
Submitted on Jan 31, 2016
Thank you Mark, a fungus growth would certainly be faster than that of a lichen.
Crust fungus most likely.