What is the difference between prothallus and protonema?
| 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. |