Calyptrogen

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calyptrogen [kə′lip·trə·jən]

(botany)

The specialized cell layer from which a root cap originates.

Calyptrogen

the formative tissue found in the growing point of a root, giving rise to the rootcap. Calyptrogen, as a rule, is characteristic of monocotyledonous plants. In most dicotyledonous plants, instead of calyptrogen, there is a tissue that also gives rise to the root’s absorbent external piliferous layer; this tissue is called dermatocalyptrogen.

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