https://treespnw.forestry.oregonstate.edu/broadleaf_genera/alder.htm

Wikipedia says: The clover mite (Bryobia praetiosa) is a species of mite. Clover mites are located worldwide across every continent except Antarctica. Clover mites usually reside in vegetation, rocks, or other common surfaces in which they typically feed on nearby foliage including, but not limited to clovers, dandelions, and other available plants. Description Clover mites are oval-shaped arachnids, 0.75–0.85 mm […]