Flora of North America species comparison

green with black apical band, spreading, 1–6 × 1–5 mm;

teeth 3–14, not articulate.

somewhat elongate, 3.5–8 × 2.5–6 mm;

teeth dark, 7–14, narrow, 1–3 mm.

persisting more than a year, unbranched, 6–55 cm;

lines of stomates single;

ridges 3–12.

monomorphic, green, branched or occasionally unbranched, 2–70 cm;

hollow center 2/3–4/5 stem diam.

mostly from midstem nodes, ascending to spreading, solid;

ridges 4–5;

valleys channeled;

proximal whorls with 1st internode of each branch equal to subtending stem sheath, distal whorls with 1st internode of each branch longer than stem sheath;

sheath teeth attenuate.

apex pointed;

spores green, spheric.

=216.