Day 12: Usneas came up in conversation this morning...yes, I do have friends who talk lichens with me...so I decided to go for a drive and short walk to visit my favourite species, Usnea longissima. Besides being one of the most graceful and beautiful of our local lichens, U. longissima is highly sensitive to pollutants. You can be assured that you're breathing the best air when you find yourself amid trees adorned with its streamers.
This Usnea is largely a lowland species, but that said, it is considered threatened world-wide, and has in fact been extirpated in much of its normal range, over-harvested by collectors selling "moss" to the floral industry. The strands can be up to ten feet long, and the sight of them swaying in the breeze will quickly clue you into how this lichen is transported. They blow on the wind like feathers, the tendrils catching on any available twig, gathering into gauzy curtains of pale green lace. At this site, they seem to have a preference for cottonwood, and occur only on those trees closest to a small stream. I've monitored this location for several years, and am happy to say they seem to be thriving.
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