Prothallus

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What Wikipedia says

A prothallus, or prothallium, (from Latin pro = forwards and Greek θαλλος (thallos) = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally, the term is also used to describe the young gametophyte of a liverwort or peat moss.

Excerpt from the Wikipedia article “Prothallus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Paul K from Sydney, Australia, CC BY 2.0, via Wikimedia Commons.