periderm

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periderm The thin, sheet-like material that makes up the skeleton in graptolites (Graptolithina). Long thought to be chitin, it is now considered perhaps to be collagen (a scleroprotein). It is bi-layered, with an inner fusellar layer and outer cortical layer which have distinct structural differences.

periderm

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periderm See cork cambium.

periderm

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periderm See BARK.

periderm

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periderm In invertebrates, the thin sheets of material that make up the skeleton.

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periderm

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