Lichens

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Image 130 – What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every day or so.

Lichens are amazing. They’re always small, they grow in slowly expanding colonies, and they consist of cooperating fungi and algae. A number of different species of fungi can grow like this, combined with various yeasts and bacteria. The assemblage often looks like a simple plant, often almost flat, but sometimes filamentous, branching or in the form of flakes. Circular forms like the one in the image are common. The Wikipedia article listed below has photos of a range of different forms.

The grey colony in the photo has grown out from the centre ‘cleaning’ other life forms from the surface of the underlying limestone and spreading out further around the perimeter. The black lichen was destroyed as the grey lichen crossed over it, but new colonies of the black lichen have established on the clean rock left behind. The situation is dynamic, but very slow. Return for another photo a month later and little will have changed.

Lichens are the main food source for a variety of animal species from small mites and insects to the remarkably large reindeer. They tend to be protein-poor but may be rich in carbohydrates.

See also:

• Lichen – Wikipedia
• The British Lichen Society

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