解説Cross section of Blackjon, National Fruit Collection (acc. 1967-062).jpg
English: :Blackjon apple, cross-sectioned.
NFC's description of the apple is: "A coloured sport of Jonathan. Originally found in Tom Slack Orchard, Wenatchee, Washington, U.S.A. by C & O Nursery. It was selected in about 1927 and introduced in 1931. Fruits are sweet, crisp and juicy."