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Key to Selaginella

Selaginellaceae

Selaginella

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(c) Cressler, Alan M.
(c) Bradley, Keith
(c) Campos, Aidan
1 Median leaves 0.7-1.2 mm long, with bristle-tipped apex up to 1/3 the length of the leaf; plants < 6 cm in diameter; [s. FL]
1 Median leaves (1-) 1.25-1.5 (-1.8) mm long, with an acute or acuminate apex; plants > 6 cm long or in diameter; [more widespread, c. FL northwards].
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
(c) Cressler, Alan M.
  2 Leaves with margins of 3-5 rows of transparent (hyaline) cells; stomates of lateral leaves confined to near the midrib on the upper surface
  2 Leaves with margins undifferentiated or with 1-2 rows of slightly paler cells; stomates distributed over entire leaf surface
(c) Cressler, Alan M.
    3 Megaspores 0.29-0.35 (-0.38) mm in diameter, dull, closely reticulated; apices of median leaves acute to attenuated, usually keeled but with vein not extending almost to tip; lateral leaves 1.4-2.2 mm × 0.8-1.3 mm
(c) Aaron, Nathan
    3 Megaspores 0.33-0.40 mm in diameter, shiny, more loosely reticulated; apices of median leaves long-attenuate to bristled, veined, the apices frequently recurved; lateral leaves ca. 1-2 mm × 0.5-1.3 mm