Plant Anatomy - Chapter 15 Periderm Overview Introduction...

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Chapter 15: Periderm Overview: Introduction Cast of Characters Development Morphology of periderm and rhytidome Monocots Wounds Lenticels and abscission layers Summary Introduction to Periderm Periderm is protective tissue of the outer surface that is secondary. It replaces the epidermis that is stretched out in the shoots and roots of plants undergoing secondary growth. Consists of 3 parts: o Phellogen—or the cork cambium—the bifacial (towards inside and outside) meristem that makes the periderm o Phellum—or cork—produced towards the outside o Phelloderm—“the sealer layer”—produced towards the inside The non-living part of the periderm is often termed the “outer bark” or rhytidome . Cast of Characters Phellogen: the cork cambium—only one type of cell—usually slightly elongate (brick-shaped). This is the meristem. Phellum : or cork—laid down in radial files. Phellum can enlarge to various shapes, is usually compact (no air spaces). Are dead at functioning state and can be filled with air, or other substance. Have suberized cell walls. Walls are variable in thickness.
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Plant Anatomy - Chapter 15 Periderm Overview Introduction...

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