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Two species of lichen growing on a tree trunk: Lecanora chlarotera and Lecidella elaeochroma.  For close-ups of these species see here.

It was several years ago that I noticed that lichen colonies on tree trunk tend to be elongated at right-angles to the length of the trunk.  Why this is so would make a good subject for discussion in a school science lesson.  I will leave it as an exercise for the reader.

Photo taken in Whiteknights Park, Reading, UK on 2013-11-30.

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