What is the nature of cell walls in collenchyma cells?

Collenchyma cells possess unevenly thickened cell walls composed primarily of cellulose and pectin. Unlike sclerenchyma, these walls are not lignified, which maintains their flexibility. The thickening occurs at the corners of cells or along certain walls, providing mechanical strength while allowing the cells to remain living and capable of stretching as the plant grows. This unique wall composition enables collenchyma to offer both support and flexibility, making it ideal for supporting young, growing plant parts.