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Ophioglossum lusitanicum : ウィキペディア英語版 | Ophioglossum lusitanicum
''Ophioglossum lusitanicum'', the least adder's-tongue, is a small fern of the family Ophioglossaceae. It is categorised as Vulnerable by the IUCN (2001).〔(Plant Network datasheet on ''Ophioglossum lusitanicum'' )〕 == Description == ''Ophioglossum lusitanicum'' is a small winter annual fern, and consists of a simple sterile blade attached to a spike-like fertile blade with between three and eight sunken sporangia on either side. The whole plant rarely exceeds a height of 2 cm.〔Stace C. (1997). New Flora of The British Isles, second edition. Cambridge: Cambridge University Press〕 This species has a chromosome number of 2''n'' = 250–260.〔
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