Assertion: fern | /r/CapableOf | exist as tiny populations
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text: Examples of species exhibiting west-to-east transcontinental disjunctions in North America are Wright’s cliffbrake (Pellaea wrightiana), mountain holly fern (Polystichum scopulinum), and forked spleenwort (Asplenium septentrionale); all of these ferns are well known in the western United States, and they exist as tiny populations in the mountains of the eastern states as well.