基芽耳蕨 ji ya er jue

Aspidium capillipes Baker, J. Bot. 26: 228. 1888; Dryopteris inaensis Tagawa; Polystichum inaense (Tagawa) Tagawa; P. michelii Christ; P. minusculum Christ; P. molliculum Christ.

Plants summer-green, small. Rhizome erect, short, rhizome apex and basal stipe densely scaly; scales reddish brown, dimorphic; larger scales lanceolate, entire; smaller scales narrowly lanceolate, basal margins with few fimbriate long teeth. Fronds 5-30 cm; stipe light green, slender, 2-8 cm, less than 1 mm in diam. at base. Lamina narrowly elliptic-lanceolate, green when dry, darker adaxially, 4-17 × 0.7-2 cm, gradually contracted toward base, bipinnatifid or nearly bipinnate (basalmost pinnae with 1 pair of nearly free lobes), acuminate; rachis light stramineous, sparsely scaly on both surfaces; scales reddish brown, linear, margins entire or base with few filiform long teeth, often with 1 proliferous bulbil between basalmost pinnae. Pinnae 11-30 pairs, attached at nearly right angles to rachis or ascendant, alternate or nearly opposite, narrowly approximate, nearly oblong or oblong-lanceolate, shortly stalked, bases asymmetrical and cuneate, apices obtuse or acute; acroscopic margins forming a nearly right angle with rachis, basiscopic margins forming an obtuse angle with rachis, bases pinnatipartite nearly to midrib, margins deeply pinnatifid to pinnatifid upward; middle pinnae largest, 0.5-1.4 cm × 2-4 mm; lower pinnae contracted toward base, basalmost pairs 2-7 mm, both surfaces sparsely covered with clavate brown microscales, more so abaxially. Lobes obovate or shortly lanceolate, apices with acute or sometimes obtuse tip, 1-5 lobes below midrib of middle pinnae, 2-6 above midrib; basal acroscopic lobes largest, nearly pinnatipartite to midrib, auriculate, apex with 2-4 coarse teeth or lobed to 2-4 smaller lobes; frond texture papery; venation indistinct on both surfaces, sometimes distinct adaxially, with only 1 veinlet on each lobe or coarse tooth. Sori abaxial on lower portions of veinlets, close to midrib, 1 per lobe, often 1-3 or sometimes sterile on basal acroscopic auriculate lobes; indusia present, large, brown when mature, thinly membranous, next to one another, shallowly lacerate. Spores semicircular in equatorial view; perispore sculpturing granulate with few shallow ridges.

Wet rock crevices and cliffs in subalpine forests; (1700-)2700-3900 m. Chongqing, NE and W Guizhou, W Hubei, SW and W Sichuan, Taiwan, SE Xizang, C, NE, and W Yunnan [Bhutan, NW India, Nepal].