A change in the character of a cell wall by which it becomes harder It is supposed to be due to an incrustation of lignin
- a modification of the smoothness of a cell wall surface, by which it becomes more difficult. It's allowed to be because an incrustation of lignin.
(letter.) A change in the type of a cell wall surface, by which it becomes more difficult. It's supposed to be because of an incrustation of lignin.
Similarly, the small amount of cuticular and of epidermal protection, and of lignification in succulent halophytes may also be related to the same circumstance.