interrupted fern

noun
a tall fern, Osmunda claytoniana, of eastern North America and eastern Asia, having an interruption of growth in the center of some fronds.
Also called Clayton fern.
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WordNet
interrupted fern

noun
North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Other sources of fiddleheads are the ostrich fern, the cinnamon fern, and the interrupted fern.
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