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1(d). Protostele. Psilotum, stem t.s. 2(d). Actinostele. Lycopodium, stem t.s. 3(d). Polystele. Pteridium, rhizome t.s. concentric bundles with inner xylem4(d). Ectophloic siphonostele. Osmunda, rhizome t.s. 5(d). Amphiphloic siphonostele. Adiantum, rhizome t.s. 6(d). Dictyostele. Polypodium, rhizome t.s. 7(d). Eustele. Ranunculus, stem t.s., open collateral bundles 8(d). Eustele. Lamium, stem t.s. 9(d). Eustele. Cucurbita pepo, stem t.s., bicollateral bundles 10(d). Atactostele. Zea mays, stem t.s., closed collateral bundles 11(d). Arrangement of bundles similar to atactostele in a dicot plant. Podophyllum, stem t.s. 12(d). Concentric vascular bundles with outer xylem. Convallaria, rhizome t.s. 13(d). Radial concentric vascular bundle. Ranunculus, root t.s.
