绒毛阴地蕨 rong mao yin di jue

Botrychium arisanense Masamune; B. decurrens Ching; B. lanuginosum var. leptostachyum (Hayata) Nakai; B. leptostachyum Hayata; B. modestum Ching; B. parvum Ching; B. virginianum (Linnaeus) Swartz var. lanuginosum (Wallich ex Hooker & Greville) T. Moore; B. yunnanense Ching; Botrypus decurrens (Ching) Ching & H. S. Kung; B. lanuginosus (Wallich ex Hooker & Greville) Holub; B. tibeticus Ching; Japanobotrychum lanuginosum (Wallich ex Hooker & Greville) M. Nishida ex Tagawa; Osmundopteris lanuginosa (Wallich ex Hooker & Greville) M. Nishida.

Rhizomes erect, short, apex hairy; hairs long, light brown. Common stipes stramineous to light brown, 12-30 cm, 3-6 mm in diam., fleshy, woolly-hairy; hairs sparse, whitish, long. Sterile lamina 3- or 4-pinnate, deltoid to subpentagonal, 14-45 × 10-38 cm, thin and herbaceous, degree of pubescence variable; pinnae 5-8 pairs, alternate, long stalked, 2-6 cm apart, lowest pair largest, 7-20 × 5-10 cm; pinnules 6-10 pairs, alternate, stalked, basiscopic pinnules larger than acroscopic ones, basal pinnule largest; ultimate lobes acute or obtuse; veins free, simple or forked. Sporophore with stalk 2-10 cm, hairy, arising at various points between lowest two pairs of pinnae of sterile lamina, usually close to base of second lowest pinnae; spikes 2- or 3-pinnate, paniculate, 7-12 × 5-7 cm, hairy. Spores yellowish, surface reticulate, finely striate on ridges. 2n = 180, 270, 360.

Evergreen broad-leaved forests; 1000-3000 m. Guangxi, Guizhou, Hunan, Sichuan, Taiwan, Xizang, Yunnan [Bhutan, India, Indonesia (Java, Sumatra), Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam].

C. B. Clarke (Trans. Linn. Soc. London, Bot. 1: 588. 1880) treated material of Botrychium lanuginosum as the following species, B. virginianum.