滇东南耳蕨 dian dong nan er jue

Plants evergreen. Rhizome erect, short, rhizome apex and stipe base densely scaly; scales mostly spreading, brown to dark brown or castaneous, ovate-lanceolate, thickly membranous, entire, some scales appressed and thinly membranous. Fronds 25-50 cm; stipe stramineous, 5-15 cm, ca. 1 mm in diam. at base; distal stipe scales sparser, similar to basal stipe scales but smaller. Lamina 1-pinnate, green when dry, adaxially darker, lanceolate, or narrowly elliptic-lanceolate, 15-30 × 2-8 cm, often slightly contracted at base, sometimes as wide as middle pinnae or wider, acuminate; rachis stramineous to light greenish stramineous, without proliferous bulbils, abaxially sparsely scaly; scales mostly appressed, brown or upper part castaneous, ovate-lanceolate, entire. Pinnae 30-45 pairs, attached at right angles to rachis, sometimes slightly ascendant or basiscopically, approximate, alternate or nearly opposite, oblong or oblong-lanceolate, bases asymmetrical, acroscopic side wider, basiscopic margins broadly oblique, obviously narrower, acroscopic base nearly lobed to midrib, distal margins pinnatilobate to pinnatisect, apices obtuse or acute, sometimes shortly acuminate. Lobes 5-10 pairs, basal acroscopic lobes obviously largest, auriculate, oblong or obovate, bases cuneate, margins biserrate with acute and shortly spinulose apex or pinnatilobate, apices rounded-obtuse; other lobes obovate, oblanceolate or nearly linear, bases cuneate or as wide as upper portions, acroscopic margins often lobed into 2-7 coarse teeth, teeth acute and spinulose; abaxially sparsely covered with brown microscales; frond texture thinly papery; venation pinnate on lobes from base to apex, dichotomous or simple, 1 veinlet on each tooth or lobe, veinlets not reaching lobe apex or tooth apex. Sori small, terminal on veinlets, close to pinna margin; indusia present, grayish brown, slightly wider than lobes, membranous, entire, evanescent. Spores elliptic in equatorial view; perispore sculpturing plicate with spinules and granules.

● Limestone crevices in montane broad-leaved evergreen forests; 1100-1800 m. SE Yunnan (Malipo, Xichou).