A Text property defining a single value. Structure: pinna A subproperty of leaf A Part of leaf P Pinnae B Basal pinnule architecture Basal pinnule arrangement
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Asplenium adiantum-nigrum 18 Pinna pairs 1–2(–4); blades ovate-deltate, with fine nonglandular hairs on veins. Asplenium pumilum 18 Pinna pairs 5–35; blades mainly
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many, and stichos, row, presumably in reference to the rows of sori on each pinna Treatment appears in FNA Volume 2. Plants terrestrial. Stems decumbent to
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North American mountains. Botrychium montanum 12 Distance between 1st and 2d pinna pairs greater than that between 2d and 3d pairs; segments asymmetric, enlarged
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mature, herbaceous to leathery. Leaf primordia glabrous. Leaf sheath closed. Pinna lobes and segments, when present, asymmetric, either borne basiscopically
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indusium absent. Sporangia scattered along veins near pinna margins (often clustered near notches between pinna lobes), containing 32 or 64 spores, not intermixed
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to form common vein extending to sinus. > 3 2 Pinna margins hooked-serrate. Thelypteris serrata 2 Pinna margins entire to undulate or crenulate. Thelypteris
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glands producing yellowish farina (sparse in Pellaea wrightiana). > 8 8 Pinna costae usually shorter than or equal to ultimate segments; largest pinnae
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fertile blades 1-pinnate, sori on linear pinnae and enclosed by hardened pinna margin. Matteuccia 5 Stolons present, wiry, arising from stem; blades 1-pinnate;
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covering sori. Sporangia intramarginal, sori usually continuous except at pinna or segment apex and sinuses, paraphyses present. Spores brown, trilete, tetrahedral
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leathery. Leaf primordia densely hairy, hairs 1.5–2mm. Leaf sheath closed. Pinna divisions reduced in size to tip (except B. biternatum, B. dissectum, and
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herbaceous to papery. Pinnae articulate to rachis, sometimes deciduous, segment (pinna) margins entire, crenulate, or biserrate; proximal pinnae (usually several
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fleshy. Pinnae to 5(–9) pairs, spreading, usually remote, separated 1–3 times pinna width, in some populations irregularly and extensively fused with considerable
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not winged; only terminal pinna decurrent on rachis. Pinnae 1–3 pairs, well separated, blade often 5-parted with terminal pinna and 2 lateral pairs of pinnae
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[alternate]; proximal pinnae often prolonged basiscopically, each proximal pinna nearly equal to distal part of leaf in size and dissection (except in var
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distally with lanceolate apical pinna that is 1/4 to equaling longest lateral pinna; buds sometimes present at base of proximal pinna. Pinnae lanceolate, 15–25
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subsessile to short-stalked (stalks terminating in cupulelike swelling at base of pinna in A. tenerum), round, fan-shaped, rhombic, or oblong, 3–29 mm wide; base
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mm, margins ciliate-dentate. Leaves 11–130 cm. Blade pinnate-pinnatifid, pinna pairs 30–60. Pinnae deltate to ovate, largest 7–35 mm, symmetrically lobed
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glabrous or sparsely glandular; rachis rounded to slightly flattened adaxially. Pinna costae straight to slightly flexuous, branches not arising from prominent
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lobed, distal pinnae only slightly smaller, blade ending in basally lobed pinna ± similar to lateral pinnae, papery or somewhat leathery. Pinnae not articulate
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serrate or ± entire; apex obtuse. Veins free, evident. Sori 2–4 pairs per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n =
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ciliate-dentate to entire. Leaves 7–40 cm. Blade 1-pinnate to pinnate-pinnatifid, pinna pairs 20–50. Pinnae oblong, largest usually 4–7 mm, entire or asymmetrically
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deltate, simple to lobed to pinnate proximally, 1–6 × 1–3.5 cm, proximal pinna pair largest; base broadly cuneate to truncate; margins irregularly crenate;
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mostly separated by pinna width, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, oblanceolate
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glabrous. Pinna apex acute. Proximal pinnae 2–9 cm, strongly curved toward apex of leaf, basiscopic pinnules strongly curved toward apex of pinna; basal basiscopic
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Fertile blades erect, narrowly rhombic, 1-pinnate, without conform terminal pinna, 25-65 × 3-15 cm, glabrous. Sterile blades spreading, narrowly oblanceolate
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coarsely incised; apex acute to rounded. Veins free, obscure. Sori 1–15 per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n =
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4-pinnate-pinnatifid], gradually reduced distally to pinnatifid apex or apical pinna similar to (conform) adjacent pinnae, herbaceous to papery. Pinnae not articulate
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specimens; apex acute to obtuse. Veins free, evident. Sori 1–12 pairs per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n =
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, occasionally
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hairs. Pinnae all narrowly to broadly triangular; terminal segment of each pinna ca. 10 times longer than wide, longer ultimate segments several times their
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triangular, distal pinnae narrowly triangular or oblong; terminal segment of each pinna ca. 2–4 times longer than wide, longer ultimate segments less than their
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, ovate-rhombic
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ovate-lanceolate or triangular, distal pinnae oblong; terminal segment of each pinna ca. 6–15 times longer than wide, longer ultimate segments 1–2 times their
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, broadly fan-shaped
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pairs, spatulate-ovate
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to form parallel rows of usually more than 10 areoles between costa and pinna margin, areoles each with a single excurrent, usually free, vein produced
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apparently indeterminate growth; pinnae opposite, in 1–several pairs, each pinna 1–many times forked, equal, each fork bearing arrested apex (bud) covered
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measurement Basal pinna architecture Basal pinna architecture or shape Basal pinna arrangement Basal pinna count Basal pinna length Basal pinna orientation Basal
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less than 50 cm; pinna margins ± entire. Blechnum occidentale var. minor 2 Blades 1-pinnate throughout, usually more than 50 cm; pinna margins ± evenly
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in 1 row between midrib and margin, ± round, covered by hardened revolute pinna margin; indusia vestigial, triangular, persistent but not easily seen in
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Blade 30–70 cm, broadest at or near base, abruptly narrowed distally, apical pinna ± similar to lateral pinnae, 5–17 × 1–3(–5) cm. Pinnae (4–)10–22(–28) × (0
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reddish brown, ovate, glabrous. Blade elliptic, 15–60 cm, proximal 4–10 pinna pairs gradually smaller toward base (smallest often less than 5 mm), blade
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somewhat evident, mostly free, rarely anastomosing. Sori 1–10(–15+) pairs per pinna, on both acroscopic and basiscopic lobes. Spores malformed (sterile form)
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apex rounded to acute. Veins free, evident. Sori as many as 30 or more per pinna, usually 1–5 per segment, on both basiscopic and acroscopic sides. Spores
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cm, gradually decreasing in length toward base; segments 20–40 pairs per pinna. Petiole of sporophyll 11–24 cm, base scaly. Blade oblong to oblanceolate
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1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, obliquely
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oblong-lanceolate, 2–3-pinnate, (2–)6–12(–18) × 2.7–10 cm, thin, glabrous; basal pinna pairs unreduced to reduced 1/4; apex gradually reduced, not rooting. Rachis
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obtuse, broadly rounded. Veins free, evident to obscure. Sori 1–3 pairs per pinna on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n = 144
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