Bible Dictionaries
Prothallus
Webster's Dictionary
(n.) The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the oophoric generation of ferns, etc.
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Bibliography Information
Webster, Noah. Entry for 'Prothallus'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/prothallus.html. 1828.