肿足蕨 zhong zu jue

Polypodium crenatum Forsskål, Fl. Aegypt.-Arab. 185. 1775; Aspidium crenatum (Forsskål) Kuhn (1868), not Sommerfelt (1834), nor Mettenius (1856); Dryopteris crenata (Forsskål) Kuntze; Hypodematium onustum Kunze; H. pilosum Ching; Nephrodium crenatum Baker (1877), not Stokes (1812), nor Desvaux (1827), nor Keyserling (1873).

Plants (12-)20-50(-60) cm tall. Rhizomes creeping, ca. 3 cm in diam., densely scaly together with stipe base; scales reddish brown, narrowly lanceolate to oblong-lanceolate, 0.5-3 cm, membranous, margin entire, apex acuminate. Fronds approximate; stipe stramineous, (5-)10-25(-30) cm × 1-3 mm, swollen base covered with scales, upward with grayish white hairs; lamina pentagonal-ovate, 20-30 × 18-30 cm, 3-pinnate-pinnatifid, herbaceous, densely covered with long hairs on both surfaces, rachis, costae, and costules, base truncate or cordate, apex acuminate; pinnae 8-12 pairs, slightly oblique, lower 1 or 2 pairs subopposite, upper pairs alternate; basal pinnae largest, deltoid-oblong, (3.5-)10-20 × (3-)5-10 cm, 2-pinnate-pinnatifid; upper pairs of pinnae gradually reduced and confluent; pinnules 6-10 pairs, anadromous, alternate, acroscopic ones smaller, proximal basiscopic pair largest, ovate-triangular, (1.5-)3-7 × (1-)2-5 cm, shortly stalked, base cuneate, margin pinnate-pinnatifid, apex acuminate; ultimate segments oblong, margin entire or undulate, apex obtuse. Veins obvious on both surfaces, pinnate, simple, ending at margin. Sori dorsal, 1-3 per segment, at middle of veinlets, orbicular; indusia persistent, pale gray, reniform, large, membranous, densely covered with hairs. Spores ellipsoid, bearing prominent, inflated folds. 2n = 82.

Crevices of limestone rocks in xeric areas, on brick walls; sea level to 1800 m. Anhui, Beijing, E Gansu, Guangdong, Guangxi, Guizhou, Henan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [N India, Japan, Malaysia, Myanmar, Philippines; Africa, SW and subtropical regions of Asia].