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Cystopteris bulbifera
''Cystopteris bulbifera'' (bulblet bladderfern) is a low-growing rock fern with creeping stems and narrow elongate deltate fronds which grow to 75 cm (30 in), native to eastern North America with two disjunct populations in the west. It is found only on calcareous substrates such as limestone. It commonly festoons limestone cave openings. While most commonly found on vertical rock faces, it also grows in rocky scree. ''C. bulbifera'' is unusual among ferns in producing bulblets along the bottom of the fronds. This is one of the easiest ''Cystopteris'' species to identify.
This species is known to hybridize with ''Cystopteris fragilis'', ''Cystopteris protrusa'', ''Cystopteris reevesiana'', and ''Cystopteris tenuis''. Hybrids with ''C. fragilis'' have given rise to the allohexaploid species ''C. laurentiana''. Hybrids with ''C. protrusa'' have given rise to the allotetraploid species ''C. tennesseensis''. The hybrid with ''C. reevesiana'' has given rise to the allotetraploid species ''C. utahensis''. The hybrid with ''C. tenuis'' is known as ''C. Xillinoensis'', an allotriploid. Also see Cystopteris hybrid complex.
==References==
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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