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- W2098187898 abstract "Phyllotaxis in Lycopodium lucidulum consists of low alternating spirals, with the adult shoots corresponding to a system of 5 + 5 contact parastichies in which there are ten orthostichies. Each major stelar lobe is a sympodium of the leaf traces of two orthostichies and each lobe has two mesarch xylem poles, Differentiation of both the procambium and xylem of the leaf traces is bidirectional, that is differentiation first commences in the leaf base and then is acropetal into the leaf and basipetal into the stem. Furthermore, the procambium of the axis does not extend above that of the youngest leaf primordium and the axial procambium is in part a composite of that of the leaf traces. Thus, it is concluded that the stele in this taxon is not a strictly cauline structure. The shoot apex consists of four zones—a zone of surface initials, a zone of subsurface initials, a peripheral zone and a rib meristem. This zonation pattern is essentially the same as that of the seed plants. From their inception, gemma primordia also exhibit shoot apical zonation and are entirely different from leaves in their subsequent growth pattern and vascularization. Although the gemmae occupy leaf sites in the phyllotactic sequence, they are interpreted as arrested stem dichotomies on the basis of their development and vascular system." @default.
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- W2098187898 date "1976-02-01" @default.
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- W2098187898 title "Observations on phyllotaxis, stelar morphology, the shoot apex and gemmae of Lycopodium lucidulum Michaux (Lycopodiaceae)" @default.
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- W2098187898 doi "https://doi.org/10.1111/j.1095-8339.1976.tb01353.x" @default.
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