On river birch
Several large and small stem galls on a small Hoheria populnea.
on sword fern
Found crawling on the garage door. Could be a dog tick.
Gall on alder leaf. References all led to the same conclusion, but correction welcome if indicated.
Acari (or Acarina) are a taxon of arachnids that contains mites and ticks. The diversity of the Acari is extraordinary and its fossil history goes back to at least the early Devonian period. As a result, acarologists (the people who study mites and ticks) have proposed a complex set of taxonomic ranks to classify mites. In most modern treatments, the Acari is considered a subclass of Arachnida and is composed of two or three superorders or...