Question

What is the difference between prothallus and protonema?

Answer 1

Protonema	Prothallus
It is the first stage in the life cycle of a bryophytes (moss), it develops directly from the spore.	It is the gametophyte of pteridophytes like fern.
It consists of creeping, green, branched, and often filamentous structures.	It bears sex organs and produces gametes.