Osmunda regalia, flowering fern for Hywel.

Linda for years I referred to them as flowering stems then recently read an article that said otherwise Don't remember where so have just been on line and copied this I need to look at mine in the morning.
Osmunda regalis produces separate fertile and sterile fronds. The sterile fronds are spreading, 60–160 cm (24–63 in) tall and 30–40 cm (12–16 in) broad, bipinnate, with 7-9 pairs of pinnae up to 30 cm (12 in) long, each pinna with 7-13 pairs of pinnules 2.5-6.5 cm long and 1–2 cm broad. The fertile fronds are erect and shorter, 20–50 cm tall, usually with 2-3 pairs of sterile pinnae at the base, and 7-14 pairs of fertile pinnae above bearing the densely clustered sporangia.

In many areas, O. regalis has become rare as a result of wetland drainage for agriculture

Thanks for showing the photos Linda. They are very interesting. I've never seen them before.
However as I explained on your other photo they are not true flowers and they don't produce seeds. They are fronds which produce spores. I suppose they are called 'flowers' because they look different to the ordinary fronds ...
Very interesting though :)

Mine has lots of fronds this year too.

This is one I'd like to grow but I so far no joy.

Thanks everyone. The FRONDS look good and so does the rest of the Fern. It is a great plant.