365Caws is now in its 14th year of publication, and was originally intended to end after 365 days. It has sometimes been difficult for me to find new material, particularly during the winter months, but now as I enter my own twilight years, I cannot guarantee that I will be able to provide daily posts. It is my hope that along the way I may have inspired someone to a greater curiosity about the natural world. If so, I can rest, content in the knowledge that my work here has been done.
Sunday, December 4, 2016
Hypogymnia Physodes
Day 52: My fence is home to quite a variety of lichens, and calling to mind the cobbler's kids and their bare feet, I have to admit that I've never troubled myself to identify many of them. Generically, they're "fencepost lichens" in a hypothetical field guide to Crow's yard, a category which includes Usneas, Cladonias and Evernia, distinguished only by their attachment to cedar rails. I've never taken samples, never looked at potential identifying features until recently when I was prompted to do so by finding several of these small rosettes growing on the side of my house. Anything which can survive on a substrate of plastic is worthy of further study, so today I nicked a lobe and brought it indoors for examination. Thinking I had a fairly good idea where it belonged, I attempted to fit it into a family, but square peg that it was, it refused to go in the round hole. I don't know what compelled me to scrape at the dark underside with my thumbnail, but when I did so, it came away freely, revealing a white medullary ceiling. What? Waitaminit...it's a Hypogymnia! From the moment of that epiphany, the rest of the pieces fell neatly into place: Hypogymnia physodes, "one of the most common tree lichens in the north." Tree lichen, eh? Mine have a taste for vinyl siding.
Labels:
fencepost lichens,
Hypogymnia physodes,
yard
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