198. Polystichum paradeltodon L. L. Xiang, Acta Phytotax. Sin. 32: 265. 1994.
新对生耳蕨 xin dui sheng er jue
Plants evergreen. Rhizome erect, short. Fronds 10-30 cm; stipe stramineous, 3-10 cm, stipe base sparsely scaly; scales brown, narrowly ovate or broadly lanceolate, membranous, toothed, sparsely mixed with smaller scales; small scales broadly ovate at base, membranous, becoming glabrous upward, margins toothed, apices linear and narrowly caudate. Lamina green or grayish green when dry, lanceolate, 7-20 × 2-4.5 cm at middle, base truncate, not or slightly contracted, 1-pinnate, apex pinnatifid and acuminate; rachis stramineous, without proliferous bulbils, sparsely scaly adaxially; scales light brown, ovate-lanceolate or broadly ovate, membranous, bases peltate and appressed. Pinnae 12-20 pairs, alternate, shortly stalked or sessile, nearly oblong, 0.8-2 cm × 5-8 mm at middle, apices slightly curved upward, rounded or acute, bases asymmetrical, acroscopic base auriculate; auricles low and deltoid or nearly semicircular, apices acute or obtuse, proximal margins of auricles truncate or slightly curved, parallel to rachis or slightly overlapping with rachis, basal basiscopic margins narrowly cuneate, nearly truncate, coarsely dentate or with slightly recurved teeth; adaxially glabrous, abaxially sparsely covered with short light brown microscales; frond texture papery; venation pinnate, distinct on both surfaces; lateral veins pinnate above midrib from base to apex, dichotomous or simple, simple or dichotomous below midrib. Sori small, terminal on shorter veinlets, medial or close to pinna margin, in 1 row on each side of midrib of pinna, more numerous above midrib, sometimes absent below midrib; indusia present, light brown, repand. Spores brown, orbicular in equatorial view; perispore sculpturing reticulate.
● Wet limestone crevices in valleys; ca. 800 m. S Yunnan (Mengla).