In studying Vallisneria spiralis abnormal ovules were often noted. The most frequent abnormality is the occurrence of symmetrical double or paired ovules. Upon a common funiculus are borne two nucelli each possessing an inner integument, the whole enclosed by a single outer integument (Figs. 1, 2, 3). Malformations occur rarely and most of them are sterile. In Fig. 7 is shown an ovule having normal integuments with some suggestion of doubling in the nucellus but with plain dominance by the functional or larger part.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Wylie, Robert B.
"Paired Ovules of Vallisneria,"
Proceedings of the Iowa Academy of Science, 33(1), 121-124.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/13