Franche-Comté. Lichens and other Franche-Comté specialties on the program of outings at the National Botanical Conservatory

After this outing in the Chailluz woods, you'll never look at them the same way again. Botanist Yorick Ferrez invites you to discover the fusional world of lichens. One of the oldest organisms on this planet, long before plants, it emerged from the symbiosis between a fungus and an algae.

There are some 200,000 species worldwide, covering between 6 and 8% of the Earth's surface. And sometimes, in certain desert areas, entire vast expanses. This is convenient for Santa's reindeer in Lapland, who rely on them as their staple diet.

In France, the inventory reports 2,400 species, of which at least 800 are present in Burgundy-Franche-Comté.

But while they can withstand extreme temperatures, allowing them to photosynthesize at temperatures as low as minus twenty degrees, lichens are much more sensitive to air and water pollution. "This makes them excellent...

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