Thursday, January 1, 2026

At Last: Plagiothecium Undulatum


Day 81: And a happy New Year it is, because I finally identified Plagiothecium undulatum (Waved Silkmoss). It's been troubling me for at least a decade. As long as I was going after Chinese for my traditional New Year's Eve dinner and the weather was clear, albeit nippy, I decided to take a walk on my favourite Cowlitz Wildlife Area trail near Mossyrock before going to the restaurant. There were several old maples to crawl over, and a few to duck under, victims of a combination of heavy rain and winds. Many of my landmarks were no longer upright, and the trail was much more open and bright due to the decrease in canopy. However, Plagiothecium has always had a window on the sun, brief at times to be sure, but there it was in all its glory on its stump, that pale yellowish green taunting me again. I had not thought about it before I left home, so was stuck without a hand lens, and that meant it was time to get up close and personal. I did the best I could, glasses off and the moss held within an inch of my eye. That was sufficient to determine the shape of the leaves. Also missing from my bare-minimum pack was a test tube, so I did not bring a sample home. As I said, I hadn't really thought about identifying moss when I left the house. In any event, I gathered enough information to make an ID with roughly 85% confidence. Bryophytes are not my "thing," so I reserve the right to be wrong, and I won't be too ashamed to admit it if someone corrects me. That's how we learn.