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Cystopteris tenuis : ウィキペディア英語版
Cystopteris tenuis

''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 ''C. tennesseensis'' 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 ''Cystopteris tennesseensis'' 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.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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