Diphasiastrum × issleri

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Diphasiastrum × issleri
Scientific classification edit
Kingdom: Plantae
Division: Lycopodiophyta
Class: Lycopodiopsida
Order: Lycopodiales
Family: Lycopodiaceae
Genus: Diphasiastrum
D. × issleri
Binomial name
Diphasiastrum × issleri
  • Diphasiastrum complanatum subsp. complanatum (Rouy) Jermy
  • Diphasium hastulatum Sipliv.
  • Diphasium issleri (Rouy) Holub
  • Lycopodium alpinum race issleri Rouy
  • Lycopodium alpinum subsp. issleri (Rouy) Chass.
  • Lycopodium complanatum subsp. issleri (Rouy) Domin
  • Lycopodium issleri (Rouy) Domin

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.


Diphasiastrum × 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.[2] 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.[3]


  1. ^ Tropicos
  2. ^ Holub, Josef Ludwig (1975). "Diphasiastrum, a new genus in Lycopodiaceae". Preslia. 14: 97–100.
  3. ^ Haines, Arthur (2003). The Families Huperziaceae and Lycopodiaceae of New England. Southwest Harbor, Maine: V. F. Thomas Co. pp. 52–53.