Lichen growing on a rock near the river in Franzensfeste, South Tyrol. ChatGPT told me: “Typical foliose lichens expand roughly 0.5–2 mm in radius per year. If this patch is, say, 10 cm across, it could easily be 25–100 years old.” It was about 10 cm in diameter. So could be older than I am. The rock also had many smaller diameter lichens but this one seemed most impressive.
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