Lichen

This calm and muted green is named after the ever changing, subtle colour of creeping algae which ages stone so beautifully. It has a quiet and subtle

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Lichen - Wikipedia

On Becoming Lichen – EuropeNow

Lichen Crust on Desert Rocks - DesertUSA

What Is Lichen?

Yeast emerges as hidden third partner in lichen symbiosis - Purdue

I'm Just Not Lichen It

Lichens Are in an Evolutionary Race Against Climate Change, Smart News

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Lichen Biology The British Lichen Society