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Adiantum vivesii : ウィキペディア英語版 | Adiantum vivesii
''Adiantum vivesii'' is a rare species of ferns known by the common name Puerto Rico maidenhair. It is in the maidenhair fern genus ''Adiantum'',〔 in the Vittarioideae subfamily of the Pteridaceae.〔 ==Distribution== ''Adiantum vivesii'' is endemic to Puerto Rico, where it is known from a single population made up of perhaps 1000 individuals near Quebradillas, in the San Juan – Caguas – Guaynabo metropolitan area on the northern side of the island.〔(''Adiantum vivesii'': Five Year Review. ) USFWS.〕 The fern was discovered in 1985 and described to science as a new species in 1989.〔Proctor, G. R. (1989). Ferns of Puerto Rico and the Virgin Islands. ''Mem. New York Bot. Gard.'' 53:1-389〕 Soon after, it was listed as an endangered species. It is a putative hybrid between ''Adiantum obliquum'' and ''A. tetraphyllum''. In 2003 a specimen that most likely represents this species was collected on Petit Morne in Martinique by botanist Maarten Christenhusz collection number 2678 (BM, SP, TUR, U, UC), which means that the hybrid has occurred twice independently.
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