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Asplenium platyneuron ebony spleenwort

Asplenium platyneuron ebony spleenwort Aspleniaceae ASPL; Bx, pb (DeCandido 2001); NY, ct, rr, tr; R, bg, cl, cp, gb, wp;

Fern from a short, unbranched rhizome 0.3-0.4 cm thick, but covered by old leaf stalk bases. Leaves evergreen, tufted at end of rhizome; 5-50 cm long, stalk wiry, dark brown, smooth, 1/4-1/3 the length of the blade, scaly at base; blade 4-50 cm long, 2-7 cm wide, once pinnate, tapered at both ends, midrib (rachis) dark brown, wiry, shiny, leaflets alternate, 15-22 per side, almost stalkless, to 1 cm long, 0.4 cm wide, tip rounded, base with small, ear-like lobe on the lower side that overlaps the rachis, margin slightly toothed, leaflets becoming much smaller near base of blade; fertile leaves few, longer than sterile leaves, linear-oblong, with 30-50 leaflets per side, blades 1-3.5 cm long, 0.3-0.6 cm wide (Flora of North America 1993+). Spore cases oblong, brown, in fish-bone […]

Adiantum pedatum maidenhair fern

Adiantum pedatum maidenhair fern Adiantaceae ADPE; R, gb;

Fern from a creeping rhizome to 0.5 cm thick. Leaves (fronds) arising individually or few together along rhizome, twice pinnate; stalk 10-60 cm long, wiry, shiny, purple-black; blade set at right angles to stalk, 10-40 cm long and wide, horseshoe- to nearly ring-shaped with a forked, semi-circular branching pattern, primary leaflets (pinnae) 2-6, 12-22 cm long, 5-9 cm wide, all arising on one side of the rachis (axis) each pinna with numerous, fan-shaped, secondary leaflets (pinnules) in a pinnate arrangement (Radford et al. 1968), midrib close to inner edge. Spore cases 0.2-0.5 cm long, 0.1 cm wide, along the lobed outer edges of the pinnules. Wetland status: FAC-. Frequency in NYC: Very infrequent. Origin: Native. Habitat: Understory of undisturbed moist woods, high nutrient, humus-rich, soil, pH 4.6-6.6, tolerant of shade, somewhat tolerant of fire, intolerant of drought, salt (USDA, NRCS 2006). Notes: […]