pro·thal·lus noun \(ˌ)prō-ˈtha-ləs\
: the gametophyte of a pteridophyte (as a fern) that is typically a small flat green thallus attached to the soil by rhizoids
: a greatly reduced structure of a seed plant corresponding to the pteridophyte prothallus
Illustration of PROTHALLUS
Origin of PROTHALLUS
First Known Use: 1854
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