Phloem are hollow tubes made of up many connected cells (sieve tubes elements). The cell walls between each of the cells are perforated into structures called sieve plates. ... The cells are dead and hollow and have very thickened cell walls that are impregnated with lignin.

Do phloem cell walls contain lignin?

Lignin is also present in phloem, but is present in low amounts as compared to xylem. Cork also contains lignin but the predominant material in cork is suberin. Parenchyma is a living cell, that's why Lignin is absent in parenchyma.

Which plant tissues contain lignin?

Lignin is deposited mainly in tracheids, vessels, fibres of xylem and phloem and sclerenchyma.