Enterioni or Pith (in Latin Medulla) is called the soft, spongy and light substance found in the center of the stem of many plants.

It

usually consists only of cellular tissue

.

At the plant’s early age, the cells that form enterioni are full of liquids, but later they are dried resulting in lignification of these cells.

That is why Theophrastus calls enterioni ‘uterus’ or ‘heart’ (

Φ

.

Ί

. 1,2,6) and distinguishes it in fleshy, membranous and woody (

Φ

.

Ί

.1, 6,1). Communication between overland and underground organs of the plant occurs through the cells vascular bundles.

That is to say,

water is transferred from the roots to the leaves, where through photosynthesis carbon dioxide from the atmosphere is captured, oxygen is emitted,

food is composed, and the life cycle continues...