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June 22, 2012
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Southeastern, New Hampshire
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This fern is similar to Cinnamon Fern (Osmunda cinnamomea) and Interrupted Fern
(Osmunda claytoniana). Cinnamon Fern has a complete separate cinnamon-colored
stalk of spores. Interrupted Fern has fertile frond leaflets (pinnae) and then spores
in the middle followed by more leaflets. Royal fern has spores covering the tops of the
fertile frond. Another difference is the Royal Fern has much longer and wider-space
(alternating) pinnules (leafules). It is often found next to water.
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