Osmunda regalis (Royal Fern) is found naturally in the northern Illinois are in sandy soils. Very tall deciduous fern with large fiddleheads that can tolerate more light than most other native ferns. However, it likes it feet consistently wet.
This Species Genotype is Unknown From the Greater Midwest
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Photos: Christian Fischer [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons