Steve Schwartzman brought up the subject of galls in his recent blog post of an Oak Gall. Most often they are just a plain lump or roundish growth found on a leaf or stem. Many species of plants are gall hosts which most often are caused by an insect looking for a safe structure for its young to develop. This usually happens early in the growth cycle of the plant and develops as a result, most often, of injection of some chemical from the adult or larva. Often the larva will consume some of the interior structure as it grows toward adulthood.
While most galls are fairly plain in shape and coloration, others can be colorful and interesting. I have not photographed many, but one day while hiking at High Ledges I noticed these Wool Sower galls on s small White Oak sapling along the Waterthrush Trail.
Ain’t nature something else? 🙂