The Mossy-cup oak. (Q. olivï¾œformis.) This is so called because the scales of the cups terminate in a long, moss-like fringe, nearly covering the acorn. It is quite a rare species, being only found on the upper banks of the Hudson, and on the Genesee river. The foliage is fine, large, and deeply cut, and the lower branches of the tree droop in a beautiful manner when it has attained some considerable size. Quercus macrocarpa, the Over-cup White oak, is another beautiful kind found in the western states, which a good deal resembles the Mossy-cup oak in the acorn. The foliage, however, is uncommonly fine, being the largest in size of any American species; fifteen inches long, and eight broad. It is a noble tree, with fine deep green foliage; and the growth of a specimen planted in our grounds has been remarkably vigorous.