Sunday, February 28, 2016

Bullseye lichen

The passage of time marked in textures ...

From outer, new edge inward; leafy, greenish thalli shrink, turn grey, then whitish and crumbly as they mature.
In crustose lichens, the area along the margin is where the most active growth is taking place. ... Most crustose lichens grow only 1–2 mm in diameter per year. (Wikipedia)



2 comments:

  1. I see this all the time and never knew what it was! It is funny living on the coast we often see everything as it always has been, but don't know what it is!

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  2. Some are huge, so they must be very old. - Margy

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