This is the 15th year of continuous daily publication for 365Caws. All things considered, it's likely it will be the last year as it is becoming increasingly difficult for me to find interesting material. However, I hope that I may have inspired someone to a greater curiosity about the natural world with my natural history posts, or encouraged a novice weaver or needleworker. If so, I've done what I set out to do.
Saturday, July 1, 2017
Placopsis Gelida
Day 261: Bullseye! It's easy to see how Placopsis gelida got its common name "Bullseye Lichen," although the cephalodium is not always as perfectly oriented as it is in this specimen. It is this nitrogen-rich feature of lichen anatomy which makes it possible for Placopsis to colonize the seemingly bare surface of recently broken rock. When wet, this lichen may exhibit a greenish-blue tint. Placopsis is a "pioneer" species, i.e., one of the first to establish itself on freshly exposed surfaces. It contributes to the breakdown of rock and in decay, supplies both the matter and nutrients in which vascular plants can establish themselves. The next time you see a rock cliff dappled with wildflowers, thank the lichens which made it possible for them to thrive.
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