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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Quercus macrocarpa' from the website Trees and Shrubs Online (treesandshrubsonline.
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A deciduous tree 80 to 170 ft high in the wild; bark with prominent, fairly firm ridges; young shoots and buds downy. Leaves obovate, 4 to 10 in. (sometimes 1 ft) long, about half as wide, wedge-shaped at the base, five- or seven-lobed, the terminal lobe often large (consisting of about half the leaf), ovate and itself wavy-lobed, the lower lobes often reach almost to the midrib, dark green, glabrous and glossy above, covered beneath with a pale, dull, minute felt; stalk up to 11⁄4 in. long, downy. Acorn 3⁄4 to 11⁄2 in. long, usually solitary, about half enclosed in a cup distinguished by having the scales near the rim almost thread-like and forming a fringe, on account of which this tree is often known as the ‘mossy-cup oak’.
Native of eastern N. America; introduced in 1811. It is very similar to Q. bicolor, but is distinguished by the more deeply lobed leaves, and especially by the acorn cup. Like all the white oaks of America, it is not very happy in our climate, but there are a few healthy trees at Kew, the largest of which, near the Ash collection, measures 67 × 63⁄4 ft (1967). In the Oak collection there are two specimens: pl. 1871, 52 × 53⁄4 ft; pl. 1874, 56 × 41⁄2 ft (1972).
specimens: Kew, near Ash Collection, 69 × 7 ft (1973), in Oak Collection, pl. 1871, 52 × 53⁄4 ft and, pl. 1874, 56 × 41⁄2 ft (1972); Holland Park, London, 85 × 71⁄2 ft (1986); Tilgate Park, Sussex, 82 × 71⁄2 ft (1984).