The gametophyte generation of ferns is the:

A) prothallus.
B) protonema.
C) fiddlehead.
D) gemma.
E) thallus.

Gametophyte

A stage in the life cycle of plants and algae that undergoes alternation of generations, responsible for producing gametes.

Prothallus

The free-living, haploid gametophyte in ferns and other seedless vascular plants.

Ferns

Non-flowering vascular plants that reproduce via spores and have fronds, part of the Pteridophyta division.