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Fluorescent and scanning electron microscopy (SEM) of fossil and modern juniper leaves. (a, b) Fluorescent microscope imagery of fossil juniper branchlet (LACMHC 1469B). (b) Close-up of leaf scale with smooth leaf margins and acute-slightly obtuse apical shape. (c) SEM image of entire fossil leaf scale from adaxial (dorsal) perspective. (d–g) Close-up imagery of abaxial (ventral) side of modern (d) J. blancoi, (e) J. scopulorum, (f) J. virginiana, and (g) fossil juniper leaf (P23-47594).

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