protophloem
noun
pro·to·phlo·em
ˌprō-tə-ˈflō-ˌem 
: the first-formed phloem that develops from procambium, consists of narrow thin-walled cells, and is usually associated with a region of rapid growth
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“Protophloem.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protophloem. Accessed 3 Jul. 2025.
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