A mutant strain of corn obtained by ultra violet treatment has twin growing points in the embryo. The flattened emerging coleoptile is a continuous sheath, containing two distinct stem apices, each of which lays down a series of leaf primordia. Each growing point becomes encircled by its laterally overlapping young leaves. The procambium strands of the two young axes converge into the stele of the mesocotyl (first internode), which is common to the two potential stems.
Proceedings of the Iowa Academy of Science
©1940 Iowa Academy of Science, Inc.
Sass, John E. and Sprague, George F.
"A "Twin-Embryo" Abnormality in Maize,"
Proceedings of the Iowa Academy of Science, 47(1), 155-156.
Available at: https://scholarworks.uni.edu/pias/vol47/iss1/22