Question

Wʜᴀᴛ Aʀᴇ Pʀᴏᴛᴏɴᴇᴍᴀ ?¿​

Answer 1

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The protonema, which grows directly from the germinating spore, is in most mosses an extensive, branched system of multicellular filaments that are rich in chlorophyll. ... The protonema is usually threadlike and is highly branched in the mosses but is reduced to only a few cells in most liverworts and hornworts.

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Answer 2

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.

Congo xD