About: Cystopteris tenuis     Goto   Sponge   NotDistinct   Permalink

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Cystopteris tenuis is sometimes known as Mackay's bladder fern or Mackay's fragile fern. It was long considered to be a part of the superspecies for fragile ferns, as Cystopteris fragilis (L.) Bernh. var. mackayi Lawson. This species is an allotetraploid of hybrid origin (see Cystopteris hybrid complex). The parent diploid species are Cystopteris protrusa and the hypothesized Cystopteris hemifragilis, believed to be an extinct species. * v * t * e

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  • Cystopteris tenuis (en)
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  • Cystopteris tenuis is sometimes known as Mackay's bladder fern or Mackay's fragile fern. It was long considered to be a part of the superspecies for fragile ferns, as Cystopteris fragilis (L.) Bernh. var. mackayi Lawson. This species is an allotetraploid of hybrid origin (see Cystopteris hybrid complex). The parent diploid species are Cystopteris protrusa and the hypothesized Cystopteris hemifragilis, believed to be an extinct species. * v * t * e (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Cystopteris_tenuis.jpg
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  • Cystopteris (en)
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  • tenuis (en)
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  • Cystopteris tenuis is sometimes known as Mackay's bladder fern or Mackay's fragile fern. It was long considered to be a part of the superspecies for fragile ferns, as Cystopteris fragilis (L.) Bernh. var. mackayi Lawson. This species is an allotetraploid of hybrid origin (see Cystopteris hybrid complex). The parent diploid species are Cystopteris protrusa and the hypothesized Cystopteris hemifragilis, believed to be an extinct species. C. tenuis is known to hybridize with C. bulbifera to produce the hybrid C. Xillinoensis, with top produce the hybrid C. Xwagneri, and with C. fragilis and C. protrusa to produce unnamed hybrids (as per Flora of North America). Mackay's fragile fern grows on rock or in scree, generally in sheltered spots, in the northeastern United States. It may be distinguished from the somewhat similar by the fact that it grows on acid substrate, while the tennesseensis grows on calcareous substrate. The fronds of tenuis are broader, with generally alternate pinnae, while tennesseensis is narrower, with generally opposite pinnae. * v * t * e (en)
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