periderm

views updated May 08 2018

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

views updated Jun 08 2018

periderm See cork cambium.

periderm

views updated May 14 2018

periderm See BARK.

periderm

views updated May 18 2018

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