Photo: Osmunda cinnamomea 2.

Spore leaf. I think. The purple flower in the background is not this fern... Gothenburg bot.g., Sweden. Planted. 2005-06-04.

Osmunda cinnamomea L.
Engl.: cinnamon fern, buckhorn, cinnamon-colored fern.
Deu.: Zimtfarn.
Jap.: yamadori-zenmai.
Bot. syn.: Osmunda imbricata Kuntze