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Asplenium scolopendrium
''Asplenium scolopendrium'', known as hart's-tongue or hart's-tongue fern (syn. ''Phyllitis scolopendrium'') is a fern in the genus ''Asplenium'', of the Northern Hemisphere.
==Distribution==
''Asplenium scolopendrium'' is a common species in Europe, but in North America occurs as rare, widely scattered populations that have been given varietal status, ''A. scolopendrium'' var. ''americanum''. Morphological differences are minor, but the North American populations are tetraploid, whereas those occurring in Europe are diploid.
In the United States, ''A. scolopendrium'' var. ''americanum'' was declared endangered in 1989. The reason that the European variety is relatively widespread, and the American variety a rarity, has apparently not been established. A third variety, ''A. scolopendrium'' var. ''lindenii'', occurs in southern Mexico and Hispaniola.〔
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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