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Osmunda regalis
http://www.ct-botanical-society.org/ferns/osmundarega.html
Image and description of the Royal Fern.
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royapinn.jpg
image, pinna
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royapinl.jpg
image, pinnulae
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royafert.jpg
image, fertile pinnae
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royaferp.jpg
image, fertile pinna
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royaspor.jpg
image, sporangia on pinnula of otherwise sterile frond
Osmunda regalis var. spectabilis
http://pluto.njcc.com/~ret/Roosevelt/royaspox.jpg
image, sporangia magnified