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prothallus definitions

Merriam Webster's

noun Etymology: New Latin Date: 1854 1. the gametophyte of a pteridophyte (as a fern) that is typically a small flat green thallus attached to the soil by rhizoids 2. a greatly reduced structure of a seed plant corresponding to the pteridophyte prothallus

Oxford Reference Dictionary

n. (pl. prothalli) Bot. the gametophyte of certain plants, esp. a fern. Etymology: mod.L f. PRO-(2) + Gk thallos green shoot

Webster's 1913 Dictionary

Prothallus Pro*thal"lus, n.; pl. Prothalli. [NL., fr. Gr. ? before + ? a young shoot.] (Bot.) The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the o["o]phoric generation of ferns, etc.



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