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Diphasiastrum × issleri
''Diphasiastrum × issleri'', known as Issler's clubmoss, is a hybrid species of clubmoss known from northern Europe and a few historical collections in northern Maine.
==Taxonomy==
''D. × issleri'' is a hybrid between ''D. alpinum'' and ''D. complanatum''. Originally placed in a broadly circumscribed ''Lycopodium'' as a race of ''L. alpinum'', it was transferred to the segregate genus ''Diphasiastrum'' and raised to species level by Holub in 1975. In the past, it has been treated as a subspecies of ''D. complanatum''. American material was once believed to be a hybrid between ''D. alpinum'' and ''D. tristachyum'', but the offspring of those parents is properly known as ''D. × oellgaardii'', which has not yet been found in North America.
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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