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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;

Asplenium.platyneuron.3Fern 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 pattern, each pointing outward from along leaflet midrib. Wetland status: FACU. Frequency in NYC: Infrequent. Origin: Native. Habitat: Woodland understory, circumneutral soils, often in disturbed woodlands and from cracks in stone walls and masonry. Notes: Locally common on the stone part of the Metro North RR trestle.

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