上毛蹄盖蕨 shang mao ti gai jue

Rhizomes short, erect, apex densely clothed with dark brown, linear-lanceolate scales. Fronds caespitose; fertile fronds ca. 35 cm; stipe blackish brown at base, upward stramineous, ca. 12 cm, ca. 2.5 mm in diam., base similarly scaly, upward glabrate; lamina nearly 2-pinnate, oblong-lanceolate, up to 25 × ca. 12 cm at middle, base not narrowed, apex acuminate; pinnae ca. 16 pairs, lower pinnae subopposite; upper pinnae alternate, spreading, sessile, basal pair slightly shortened, narrowed toward base; middle pinnae falcate-lanceolate, up to 7 × ca. 1.5 cm at base, base equilateral, truncate, pinnatipartite almost to costa, apex acuminate; pinnules ca. 15 pairs, alternate, approximate, spreading, decurrent to wing of costa; lower pinnae suboblong, ca. 8 × 4-5 mm, base slightly decurrent on basiscopic side, margin subentire, apex broadly rounded and with small teeth; veins inconspicuous adaxially, visible abaxially, pinnate in pinnules, lateral veins ca. 5 pairs, usually simple, basal acroscopic veins often forked. Lamina papery when dried, greenish brown, densely pubescent with brown short hairs on adaxial surface, glabrate abaxially. Rachis stramineous, grooved and with dense pallid short hairs adaxially, costae pale purplish red, glabrate abaxially. Sori oblong, on basal acroscopic veins, 3 or 4 pairs per pinnule, biseriate on both sides of costule, inframedial; indusia brownish, oblong, membranous, entire, persistent. Perispore surface without folds.

● Forests; 1800-1900 m. N Guizhou, SW Sichuan.