Protonema

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A protonema (plural: protonemata) is a thread-like chain of cells that forms the earliest stage of development of the gametophyte (the haploid phase) in the life cycle of mosses.

Excerpt from the Wikipedia article “Protonema”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Gaston Bonnier, Public domain, via Wikimedia Commons.