North America, Europe, Eastern Asia
North America, United States, Northeastern United States, Mid-Atlantic United States, Southeastern United States
M. struthiopteris var. struthiopteris
M. struthiopteris var. pensylvanica
Osmunda regalis var. regalis, Osmunda regalis var. panigrahiana, Osmunda spectabilis
Forest margins, Roadsides, Terrestrial
Banks, Boggy areas, stream banks, Woodlands
A1, A2, A3, 1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20
A2, A3, 1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17