What does prothallus mean?
In botany, the prothallus is a small, flat, green or yellowish structure that develops from the spore of a fern or other cryptogam, and serves as the sexual organ of the plant. It is usually found on the underside of the frond.
Example
"The prothallus of the fern was visible on the underside of the leaf."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.