Regularity: Regularly occurring
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
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.
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.
- Holub, Josef Ludwig (1975). "Diphasiastrum, a new genus in Lycopodiaceae". Preslia 14: 97–100.
- Haines, Arthur (2003). The Families Huperziaceae and Lycopodiaceae of New England. Southwest Harbor, Maine: V. F. Thomas Co. pp. 52–53.
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