Prothallus

 : 
Noun
 : 
pro=thal=lus

CIDE DICTIONARY

Prothallusn. [NL., fr. Gr. before + a young shoot.].
     The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the oöphoric generation of ferns, etc.  [1913 Webster]

OXFORD DICTIONARY

Prothallus, n. (pl. prothalli) Bot. the gametophyte of certain plants, esp. a fern.

Etymology
mod.L f. PRO-(2) + Gk thallos green shoot

For further exploring for "Prothallus" in Webster Dictionary Online


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