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166. Dryopteris peranema Li Bing Zhang, Taxon. 61: 1211. 2012.

柄盖鳞毛蕨 bing gai lin mao jue

Peranema cyatheoides D. Don, Prodr. Fl. Nepal. 12. 1825.

Plants up to 1.8 m tall. Rhizome erect, short, robust, densely covered with scales; scales dark brown, subulate, up to 3.5 cm, ca. 2.5 mm wide at base, margins with clavate short hairs, thickly membranous, brown rufous, nitid. Fronds tufted; stipe 25-65 cm, 4-10 mm in diam., brown-stramineous, densely covered with scales same as on rhizome, sparser and smaller upward, longitudinally grooved on adaxial side; lamina dark brown when dry, narrowly ovate, 70-130 × 30-70 cm, tripinnate to quadripinnatifid, papery, subglabrous abaxially, sparsely covered with dark brown short nodose hairs adaxially, apex acuminate; pinnae 15-20 pairs, opposite, alternate upward, close together, with short stalk ca. 1 cm, basal 2 or 3 pairs 7-8 cm apart, elliptic or elliptic-lanceolate, slightly falcate, 22-28 × 8-10 cm, apex acuminate, basiscopic pinnules larger than upper ones, tripinnatifid; pinnules 15-20 pairs, with short stalk, basal ones subopposite, 1.5-2 cm apart, always slightly shortened, upper ones close together or slightly overlapping; ultimate pinnules 9-16 pairs, basal 2-4 pairs opposite, alternate upward, sessile, separate, elliptic, 1-1.5 × 0.4-0.5 cm, base rounded-truncate, pinnatifid almost to rachillae, apex obtuse and crenate; lobes 4 or 5 pairs, opposite, elliptic, 3-4 × ca. 2 mm, apex truncate, margin entire or with 2 or 3 indistinct obtuse teeth; rachis and rachillae covered with few long subulate brown scales and brown nodose hairs, shallowly longitudinally grooved on adaxial side; veins invisible, pinnate, fibriform, veinlets submarginal, apex with slightly swollen hydathodes. Sori globose, ca. 1 mm in diam., always 1 in each ultimate pinnule or lobe, 1 row on each side of rachillae; indusium brown, leathery, with long stalk, dehisced into 2 or 3 irregular valves from top when mature. x = 41.

Near streams, forests; 1800-3100 m. SE Xizang, NW Yunnan [Himalaya].


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