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Journal Article

Foliar Venation of Angiosperms. II. Histogenesis of the Venation of Liriodendron

Thomas R. Pray
American Journal of Botany
Vol. 42, No. 1 (Jan., 1955), pp. 18-27
Stable URL: http://www.jstor.org/stable/2438589
Page Count: 10
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Foliar Venation of Angiosperms. II. Histogenesis of the Venation of Liriodendron
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Abstract

The meristematic margin of the young lamina of Liriodendron is basically five layers thick, the central layer producing the entire vascular system of the lamina. The secondary veins start to differentiate soon after laminal formation is initiated, and develop progressively toward the margin. Between the secondaries, tertiaries and then quaternaries, etc., are differentiated until the ultimate areoles are delimited. All intersecondary veins apparently differentiate simultaneously between existing procambial strands. Vein endings develop progressively from strands delimiting the ultimate areoles. Secondaries are multiseriate in origin, while intercostal veins are largely or entirely derived from single files of initials. The details of procambial differentiation from the homogeneous ground meristem are described. Procambium is always continuous with differentiated procambium. Phloem maturation precedes that of the xylem and is continuous. Instances of initially discontinuous xylem were observed in veins of all categories excepting vein endings.

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