The Structure and Development of Vascular Nodules in Apple Bud-unions: With two Plates and two Figures in the Text

An account is given of the development of new meristematic centres(vascular nodules) initiated in callus tissue formed in applestems as a result of budding. Both amphivasal (xylem peripheral)and amphicribral (phloem peripheral) nodules occurred, and attentionis drawn to the relationship between the type of nodule formedand the tissue in which it originated. The similarity of thesestructures to the meristematic nodules arising in tissue culturesis discussed, and their possible practical significance as anaid in the rooting of cuttings pointed out.