protophloem

noun
pro·​to·​phlo·​em | \ˌprō-tə-ˈflō-ˌem \

Definition of protophloem 

: the first-formed phloem that develops from procambium, consists of narrow thin-walled cells, and is usually associated with a region of rapid growth

First Known Use of protophloem

1884, in the meaning defined above

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The first known use of protophloem was in 1884

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