descending is a form of:

Parenchyma



noun
1.
(វេជ្ជសាស្ត្រ) ជាលិកាទន់, កំពកទន់ៗ
ENGLISH MEANING
noun
1.
The soft celluar substance of the tissues of plants and animals, like the pulp of leaves, to soft tissue of glands, and the like.