Excerpt from Suspensor and Early Embryo of Pinus: A Dissertation
It has long been recognized that the embryos of plants furnish trustworthy morphological features for comparison in the study of phylogeny, but the surprising variations found in the proembryos of various gymnosperms have always been more or less of a stum bling block. This work was undertaken with the hope that a more critical study of the suspensor and early embryo of Pinus and of the phenomenon of polyembryony might prove of value in properly interpreting the rather flexible program that has been ascribed to this genus. Here it is, also, that we find a striking parallel to some of the early cleavage phenomena involved in the biology of twins in animals, a subject of some current interest to zoologists.
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