Flora of North America species comparison

leaves equilateral to isosceles-triangular, small, less than 0.8 mm, mostly appressed to stem, apex acute to obtuse, hyaline cells efibrillose and nonseptate.

leaves usually smaller than branch leaves, triangular to lingulate, apex apiculate, acute, broad, or erose and split, border narrow or broad at base;

hyaline cells non-ornamented, usually efibrillose (in proximal portion) to often fibrillose in distal portion of leaf, aporose or with few pores and septate to nonseptate.

straight to slightly curved, usually 5-ranked;

leaves not much longer at distal end than proximal end.

dimorphic, pendent branches more slender and delicate than spreading branches.

narrowly ovate-lanceolate, 0.8–1 mm, straight, moderately undulate and recurved in larger and/or wetter grown forms, not undulate and slightly recurved in compact forms from drier sites;

margins entire;

hyaline cells on convex surface with 1(2–3) pore per cell at apical end of cell, on concave surface with round wall thinnings in cell ends and angles; chlorophyllous cells triangular in transverse section and just enclosed on concave surface.

usually longer than stem leaves, ovate to lanceolate;

margins entire or in a few cases serrulate;

apex involute and smooth;

hyaline cells non-ornamented, fibrillose (in one case efibrillose), convex surface porose or with a few to numerous pores or pseudopores, concave surface aporose or with pores or pore-like wall thinnings; chlorophyllous cells triangular to trapezoidal in transverse section, more broadly exposed on convex surface, end walls not thickened.

dioicous.

mostly dioicous or occasionally monoicous.

less than 2 mm, with few pseudostomata.

21–25 µm; coarsely papillose on proximal and distal surfaces;

proximal laesura more than 0.5 spore radius.

usually more than 30 µm, rarely with raised surface sculpture on distal surface;

proximal laesura typically less than or equal to 0.5 spore radius.

fascicles with 2 spreading and 2–3 pendent branches.;

branch stems with cortex enlarged with conspicuous retort cells, often pinkish red at proximal end.

fascicles with 2–3 spreading to 1–3 pendent branches.;

branch stems green to pinkish, surrounded by 1 layer of efibrillose, non-ornamented, enlarged, thin-walled cells, with solitary uniporose retort cells (or in groups) with short necks, other aporose cells rectangular.