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Scutellum |
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scutellum [skü′tel·əm]
(botany) A rounded apothecium with an elevated rim found in certain lichens. The flattened cotyledon of a monocotyledonous plant embryo, such as a grass. (invertebrate zoology) The third of four pieces forming the upper part of the thoracic segment in certain insects. (vertebrate zoology) One of the scales on the tarsi and toes of birds. Scutellum one of the principal organs in the embryo of grasses of the family Gramineae. During seed sprouting, the scutellum secretes enzymes that make soluble the reserve substances of the endosperm that nourish the developing embryo. Some botanists regard the scutellum as a cotyledon, and others as a modified axis of the embryo. 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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