It's been too long since I posted any lichen photos: these were taken on rocks just outside our front door, and illustrate, perfectly, lichenous structures. You've actually got three examples of squamulose structures, here - they're the ones that look like bubbling barnacles - and one (the yellowish one) is crustose in form. Alas, there's been no time for work on lichen this summer - and only a cursory amount of research on other parts of the book research (although I have been learning a lot about other things, which will emerge in teaching bulletins, soon enough ...)
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