Flora of North America species comparison

elongate, 4–9 × 2–5 mm;

teeth dark, 5–10, narrow, 2–5 mm, margins white, scarious.

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

teeth 3–14, not articulate.

monomorphic, green, branched or unbranched, 20–80 cm;

hollow center small, to 1/3 stem diam.;

vallecular canals nearly as large.

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

lines of stomates single;

ridges 3–12.

when present only from midstem nodes, spreading, hollow;

ridges 4–6;

valleys rounded; 1st internode of each branch shorter than subtending stem sheath;

sheath teeth narrow.

apex pointed;

spores green, spheric.

=216.

=216.