A hair on the underside of the thallus in some lower plants, especially mosses and liverworts, serving both to anchor the plant and to conduct water.
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Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
