In most liverworts, the sporangium matures before the seta elongates, pushing the sporangium above the calyptra that protected it. |
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The sporangium differentiates after the seta elongates and is protected from injury and drying by the calyptra. |
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The capsule is often covered by a calyptra, which is the enlarged remains of the archegonium. |
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The capsules of plants of the genus Encalypta are totally covered by some tissue, the calyptra. |
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The capsule and operculum are in turn sheathed by a haploid calyptra which is the remains of the archegonial venter. |
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The nodosity apical end retains the meristematic cell profiles and calyptra but does not show major histological cell modifications, which are mainly hypertrophic due to phylloxera feeding. |
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The crisped leaves, with the different nature of the peristome and mitriform calyptra, multifid at the base, are, however, certain marks of distinction. |
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