. Bulletin. 1901-13. Agriculture; Agriculture. 32 DIMOIU'ILK' LEAVES IN UKLATION TO HEREDITY. name "; The species has not been definitely identified, but Mr. F. L. Lewton suggests thai it may represent Todaro's Gossy- pium microcarpum variety rufum. The leaves of the (Julluche cotton are extremely variable in form, and many of them arc quite simple. But instead of being broadly cm-date like the simple leaves of Upland or Egyptian cottons, the simple leaves of the Culliiche cotton are fusiform or lanceolate, much like the abnormal leaves of the Egyptian cotton shown in Plate
. Bulletin. 1901-13. Agriculture; Agriculture. 32 DIMOIU'ILK' LEAVES IN UKLATION TO HEREDITY. name "; The species has not been definitely identified, but Mr. F. L. Lewton suggests thai it may represent Todaro's Gossy- pium microcarpum variety rufum. The leaves of the (Julluche cotton are extremely variable in form, and many of them arc quite simple. But instead of being broadly cm-date like the simple leaves of Upland or Egyptian cottons, the simple leaves of the Culliiche cotton are fusiform or lanceolate, much like the abnormal leaves of the Egyptian cotton shown in Plate IV and text figure 15. One of the simple leaves of the Culliiche cot- ton is shown in figure 17. Comparison of this with the illustrations of the Egpytian cotton previously mentioned will show how close a resemblance of leaf forms may arise in species of col ton that are widely different in other respects. RELATION OF DIMORPHISM TO MU- TATION. Viewed as a phenomenon of heredity, dimorphism of leaves presents an analog}' with mutative variation. The fact that the abrupt change or contrast of characters occurs in the same indi- vidual plant instead of in separate plants should increase the interest attaching to such variations, especially if it appears that the}" are of the same general nature as the mutations that give rise to new varieties. The change of characters involved in the production of dimorphic leaves has the most direct analogy with the rather rare phenomenon of bud muta- tion. Cases are known in which the expression of characters is changed in a single bud of a tree. A single branch of a tree shows a definite peculiarity not found in other branches or other trees of the same variety. A bud mutation of coffee seen in Guatemala some years ago had leaves as definitely unlike the remainder of the tree as an}" of the numerous seminal mutations of coffee that had been previously Fig. 17.—Simple leaf of Culluche cotton from Tuxtla Gutierrez, Mexico.
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