Cystopteris fragilis, Cystopteris laurentiana, Cystopteris montana, Cystopteris protrusa, Cystopteris reevesiana, Cystopteris tennesseensis, Cystopteris tenuis
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LAYOUT:treatment:TUOYAL familyDryopteridaceae genusCystopteris speciesCystopteris protrusa (Weatherby) Blasdell Mem. Torrey Bot. Club 21(4): 41. 1963. Christopher
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relatively distinct from C. fragilis and C. protrusa (although the early season, sterile leaves of C. protrusa often resemble those of C. tenuis). In the
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Cystopteris tennesseensis, an allotetraploid species, has C. bulbifera and C. protrusa as diploid progenitors. The relative distinctiveness of these diploids
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tennesseensis and because of morphologic similarities between C. reevesiana and C. protrusa (the second diploid parent of C. tennesseensis), populations of C. utahensis
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Even after segregating relatively distinct elements such as Cystopteris protrusa, C. reevesiana, and C. tenuis, and identifying sterile hybrids, C. fragilis
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several species. In the eastern portion of its range, C. bulbifera and C. protrusa are the diploid progenitors of the tetraploid C. tennesseensis (C. H. Haufler
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