Huperzia ×buttersii is a cross between H. selago and H. lucidula.
Huperzia lucidula
Within the Lycopodiaceae, Huperzia s.s. is characterized by the non-strobilar arrangement of sporophylls and presence of bulbils (also called gemmae) for asexual reproduction.







I have a voucher: 1227 Susan Fawcett, A.V. Gilman, M. Sundue, D. Avery, B. Black, J. Raiguel Huperzia × buttersii (Abbe) Kartesz & Gandhi Lycopodiaceae Lamoille Eden, ca. three miles north of town, Belvidere Mountain Asbestos Mine. 44.767401, -72.543980 In sunny quarry on disturbed ground (mine waste). Huperzia selago, Betula papyrifera, Campanula rotundifolia, Solidago nemoralis, Adiantum viridimontanum, Anaphalis margaritacea, Symphyotrichum cordifolium, Trichophorum alpinum, Osmunda regalis, O. claytoniana, Thelypteris palustris. 14 Sept. 2019
Thanks Susan!