Acrolejeunea securifolia subsp. securifolia

Epiphytic, autoicous or rarely dioicous, pale whitish-green to grayish-brown when dry. Stem irregularly branched, with branches emerging abaxial to lateral leaves without lobules or from near unmodified lateral leaves and with a lobed collar of tissue at base. Lateral leaves imbricate, widely spreading and convex adaxially when moist, sometimes slightly squarrose. Lobe asymmetrically ovate to suborbicular, 0.6–1 (–1.4) mm long, 0.43–0.75 (–1) mm wide, rounded at apex, forming a curved or almost straight keel where attached to lobule; cells circular or elliptic, becoming quadrate at margin, 27–48 μm long, 15–31 μm wide near centre, becoming smaller toward margins, with prominent trigones, usually also with intermediate thickenings. Lobule ovate, 0.3–0.5 (–0.6) mm long, 0.2–0.4 mm wide, 2/5–1/2 length of lobe, gradually flattened toward free margin, with 2–4 (–5) marginal teeth, the tooth furthest from stem 2–3 cells long, the next tooth 1–2 cells long, the remaining teeth if present composed of single cells. Underleaves obovate to oblate-orbicular, 0.18–0.4 mm long, 0.23–0.5 (–0.6) mm wide, with a rounded, truncate or very slightly emarginate apex; cells oblong, elliptic or quadrate, 15–40 μm long, 15–28 μm wide, with prominent trigones, usually also with intermediate thickenings. Androecium of 5–25 pairs of bracts; bracts differing from leaves in more inflated lobules with no marginal teeth. Gynoecium terminating short or long branch with a lobed collar at base; bracts near perianth larger than vegetative leaves and with lobule similar length as lobe. Perianth cylindric to obpyriform, 1.5–1.8 mm long, emergent to ½ its length, regularly 8–10-plicate, with a beak 3–7 cells long.