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Thal"lus (?), n.; pl. Thalli (#). [NL., fr. Gr. young shoot or branch, frond.] Bot.

A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens.


© Webster 1913.

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