The Swang – Barely a square centimeter of stone is visible

A lichen is not a single organism; it is a stable symbiotic association between a fungus and algae and/or cyanobacteria.

Like all fungi, lichen fungi require carbon as a food source; this is provided by their symbiotic algae and/or cyanobacteria, that are photosynthetic.

The lichen symbiosis is thought to be a mutualism, since both the fungi and the photosynthetic partners, called photobionts, benefit.

The British Lichen Society

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