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closeup of little black lichen "bubbles" on a rock

...on a rock.

Aren’t these cool? I’m not even sure how I spotted them, as they were pretty small. It’s some kind of little black lichen growing on a rock; I’m not anywhere near my field guides at the moment, so I haven’t a clue what it is. What I thought was interesting was the way it’s growing in concentric circles.

And it showed up on a truly gorgeous rock, just covered in a lichen-y rainbow of colours.

lichen-covered rock

Looks like sea urchins have been grazing here....

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