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metaxylem |
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metaxylem [¦med·ə′zī·ləm]
(botany) Primary xylem differentiated after and distinguished from protoxylem by thicker tracheids and vessels with pitted or reticulated walls. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Protoxylem tracheids, 6-12 [micro]m in diameter, are characterised by annular and spiral thickening with scalariform and transitional pitting seen on the 9-15 [micro]m diameter metaxylem tracheids (Fig. They have narrow phloem strands adjacent to large, single, permanent protoxylem or metaxylem elements. These are: #7, arborescence absent [right arrow] present; #16, root anatomy 2-5 arch [right arrow] polyarch; #26, stipules absent [right arrow] present; #33, dictyostele absent [right arrow] present; #34, polycyclic stele absent [right arrow] present; #38, borders on metaxylem pitting present [right arrow] absent; #39, phloem disposition ectophloic [right arrow] amphiphloic; and #66, sporangia fused forming synangia absent [right arrow] present. |
metaxylem |
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