Stems ca. 2 mm diam. Leaves partially dimorphic (sporangia limited to proximal pair of pinnae), (15--)22--45 × 8--16 cm. Petiole straw-colored, 1/2--2/3 length of leaf, ca. 1 mm wide, glabrate. Blade deltate-lanceolate, 1-pinnate, somewhat leathery. Pinnae 4--7 pairs, mostly alternate, lanceolate, base truncate, margins minutely serrulate, proximal margins often slightly excavate, apex acuminate, hirsute with minute white hairs to glabrous on abaxial surface, glabrous adaxially. Fertile pinnae usually taller than sterile blades. Spores with ridges parallel and closely placed. 2 n = 76. Rhizomes horizontal, creeping, ca. 2 mm diam.; rhizome hairs stiff, dark brown; fronds erect, (15–)30–60 cm long; stipes ca. 1/2 the frond length, ca. 1 mm diam., stramineous, glabrate; blades deltate-lanceolate, 1-pinnate, 9–18 cm wide, subcoriaceous; pinnae 5–9 pairs, lanceolate-deltate to narrowly deltate to rounded or cuneate at bases, often slightly excavate basiscopically, apices acuminate, margins minutely serrulate; veins free; blade surfaces hirsute with minute white hairs abaxially, adaxially glabrous, green or bluish green and iridescent; fertile pinnae remote from the sterile pinnae, surpassing or occasionally equal to the sterile blades; spores striate, ridges smooth, close. Lightly shaded limestone outcrops; 70–1900 m. USA (Tex); Mexico. Stems ca. 2 mm diam. Leaves partially dimorphic (sporangia limited to proximal pair of pinnae), (15--)22--45 × 8--16 cm. Petiole straw-colored, 1/2--2/3 length of leaf, ca. 1 mm wide, glabrate. Blade deltate-lanceolate, 1-pinnate, somewhat leathery. Pinnae 4--7 pairs, mostly alternate, lanceolate, base truncate, margins minutely serrulate, proximal margins often slightly excavate, apex acuminate, hirsute with minute white hairs to glabrous on abaxial surface, glabrous adaxially. Fertile pinnae usually taller than sterile blades. Spores with ridges parallel and closely placed. 2 n = 76. Lightly shaded limestone outcrops; 70–1900 m. USA (Tex); Mexico. Rhizomes horizontal, creeping, ca. 2 mm diam.; rhizome hairs stiff, dark brown; fronds erect, (15–)30–60 cm long; stipes ca. 1/2 the frond length, ca. 1 mm diam., stramineous, glabrate; blades deltate-lanceolate, 1-pinnate, 9–18 cm wide, subcoriaceous; pinnae 5–9 pairs, lanceolate-deltate to narrowly deltate to rounded or cuneate at bases, often slightly excavate basiscopically, apices acuminate, margins minutely serrulate; veins free; blade surfaces hirsute with minute white hairs abaxially, adaxially glabrous, green or bluish green and iridescent; fertile pinnae remote from the sterile pinnae, surpassing or occasionally equal to the sterile blades; spores striate, ridges smooth, close.General Information
Source: [
Source: [
Distribution
Source: [
Flora of North America @ efloras.org
General InformationMemoirs of the New York Botanical Garden
Distribution
