phloem

/floh-em/US // ˈfloʊ ɛm //UK // (ˈfləʊɛm) //

韧皮部,韧带部,髓鞘,脉管膜

Definitions

n.名词 noun

1
- : the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant.

In some cases he seems to refer to the phloem and cambium by this name, and in other cases to the perimedullary zone.
These concentric rings of secondary xylem and phloem (fig. 9) afford a characteristic cycadean feature.
The tissue in question is marked by S, c, hb in the figure, and is called phloem or bast.
The browning in the vascular bundles appeared to be confined to the phloem tissue.
The central tissue (x) is called the woody tissue (xylem); the outer, the bast (phloem).