from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The green filamentous growth that arises from spore germination in liverworts and mosses and eventually gives rise to a mature gametophyte.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A filament of cells that forms following the germination of the spores of mosses and liverworts

from the GNU version of the Collaborative International Dictionary of English

  • n. The primary growth from the spore of a moss, usually consisting of branching confervoid filaments, on any part of which stem and leaf buds may be developed.

from The Century Dictionary and Cyclopedia

  • n. In Muscineæ, a pluricellular, confervoid or filamentous, usually chlorophyllose, structure upou which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot. Also protoneme.


proto- + Greek nēma, thread.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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