What is Calyptra? And what is calyptogen?
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a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants
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Noun. calyptra (plural calyptras or calyptrae) (botany) In bryophytes, a thin, hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens. (botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers.
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