boulder fern
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| Noun | 1. |  boulder fern - fern of eastern North America with pale green fronds and an aroma like hayfern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores Dennstaedtia, genus Dennstaedtia - chiefly terrestrial ferns; in some classification systems placed in family Polypodiaceae |
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