Osmunda regalis (Royal Fern)
Also known as: | |
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Genus: | Osmunda |
Family: | Osmundaceae (Royal Fern) |
Life cycle: | biennial |
Origin: | native |
Habitat: | part shade, sun; swamps, wet woods, stream banks, shallow water |
Fruiting season: | summer |
Plant height: | 3 to 6 feet |
Wetland Indicator Status: | GP: OBL MW: OBL NCNE: OBL |
MN county distribution (click map to enlarge): | |
National distribution (click map to enlarge): |
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Detailed Information
Fiddlehead:
Ferns emerging in early spring are densely covered in woolly hair, which is quickly lost.
Leaves and stems:
Leaves are twice compound, up to 3 feet long, broadly egg-shaped in outline, the “branches” (pinnule) opposite. The leaflets are about 2 inches long and ¾ inch wide, minutely toothed around the edges, with forked veins, blunt tips, somewhat heart-shaped to nearly straight across the base, and little or no stalk. The leaflets are typically alternate with 7 to 10 on each side of a stem. Stems are brown, slender, slightly grooved on the upper side, initially covered with light brown hairs, becoming smooth with maturity.
Spores:
Bead-like capsules containing the spores are attached to a stalk growing at the tip of a leaf (Royal Fern gets its name from this “crown” of capsules at the tip of leaf). The capsules are initially bright green but turn rusty colored then dark brown after releasing the spores.
Notes:
This species doesn't look much like a fern. It can take on a shrub-like appearance and the leaves look similar to a locust tree or a vetch species. Royal fern can be identified by the double compound leaves and clustered spore capsules at the tip of the leaf. There are reportedly 4 or 5 varieties spread across nearly every continent, but only var. spectabilis is recognized in North America, and Minnesota. This has been more recently considered a separate species, Osmunda spectabilis, with O. regalis restricted to Europe, Africa and Asia, though the name change hasn't been accepted in Minnesota (yet).
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More photos
Photos by K. Chayka taken in Anoka and Ramsey counties. Photos by Peter M. Dziuk taken in Anoka County.
Comments
Have you seen this plant in Minnesota, or have any other comments about it?
on: 2014-08-18 11:48:26
This was a long time ago but I had an internship at Lowry Nature Center in 1980 and did a survey of ferns in the park. I found Royal Fern in a couple locations. I had permission to go off trail to find them otherwise the general public is not allowed to go off the trails, so I better not reveal the whereabouts! I'm sure they are probably still growing there.
on: 2017-10-10 09:21:35
Just saw some of this up on the eastern side of the BWCA last week
on: 2018-06-16 11:57:16
Now Osmunda spectabilis with O. regalis restricted to plants native to Europe, Africa, and Asia.
on: 2018-06-16 16:35:04
Charles, it usually takes a while before MN accepts such name changes but it will happen eventually.
on: 2020-09-22 18:31:47
I like this fern for some reason, and have kept track of where I find them. The last two weeks I saw them along the Baptism River near Finland, MN and in Wayside Prairie Park and Crooked Road WMA in Isanti County.
on: 2022-06-08 19:49:01
I have a bunch growing and spreading about my woods.