The rhytidome is the outermost layer of bark found on tree trunks and older roots. It is composed primarily of dead cells.
Rhytidome: The Tree's Outer Armor
The rhytidome, often referred to as the outer bark, is a crucial protective layer for trees. It forms as the tree ages and grows, providing insulation and defense against external threats.
Composition and Formation
- Dead Cell Layers: The rhytidome is built up from multiple layers of dead cells, including suberized periderm, cortical, and phloem tissue.
- Periderm Production: These layers are produced through the formation of multiple layers of suberized periderm.
- Older Stems and Roots: The rhytidome is especially well-developed in older stems and roots of trees. This makes sense as these areas are more exposed and need increased protection.
Function of Rhytidome
The rhytidome serves several key functions:
- Protection: It shields the tree from physical damage, such as animal activity or weather-related impacts.
- Insulation: The rhytidome provides insulation against extreme temperatures, helping regulate the tree's internal environment.
- Water Loss Prevention: It helps to reduce water loss from the tree's tissues.
- Defense: It can offer defense against insect and fungal attacks.
