protophloem

/proh-tuh-floh-em/US // ˌproʊ təˈfloʊ ɛm //

原生细胞,原生植物,原生质体,原生动物

Definitions

n.名词 noun

1
Botany.
- : the part of the primary phloem that develops first, consisting of narrow, thin-walled cells.