Took some matured leaflets from a Nephrolepis plant growing at our college and scraped the brown sacs (the sori) on its lower epidermis over the mud of my plant pots at home with an aim to disperse spores. The next day found some heart-shaped, tiny, green structures growing on the mud. Foldscoping those, it did seem like I grew gametophytes at home.
Some of the pictures :
I expected to see gametes too, but did not see any. Chloroplasts are clearly visible and also the fact that gametophytes of Nephrolepis comprise only a monolayer of cells!