Hypnum neckeroides Hooker, Musci Exot. 1: plate 58. 1818

Plants (4-)6-8(-10.5) cm. Secondary stem leaves 2-3.2 × 1-1.7 mm. Branch leaves oblong-ovate to ovate, 1-2.2 × 0.5-0.8 mm; margins serrate at apex; apex obtuse to broadly acute; basal laminal cells 5-8 × 1-2 µm; medial juxtacostal cells long-rhomboidal, longest axis parallel to costa, 3-5 × 1-3 µm; apical cells subquadrate to short-rhomboidal, 2-4 × 1-2 µm. Sexual condition dioicous.

Rock, humus, base of trees, shaded banks, boulders, cliffs; moderate elevations; B.C.; Alaska, Calif., Conn., Idaho, Mont., N.Y., N.C., Ohio, Oreg., Pa., Wash.; Europe (Czech Republic, Germany, Italy); Asia.

Thamnobryum neckeroides is distinguished by the distinctly concave, almost boat-shaped branch leaves, and the rounded to broadly rounded apex. The apical laminal cells are mostly subquadrate to short-rhomboidal and the medial juxtacostal cells have their longest axis parallel to the costa.

SELECTED REFERENCE Mastracci, M. 2003. Thamnobryum neckeroides (Bryopsida: Neckeraceae) lectotypification, synonymies, diagnostic characters, habitat, and distribution. J. Bryol. 25: 115-120.