39. Asplenium adnatum Copeland, Philipp. J. Sci., C. 3: 280. 1909.
合生铁角蕨 he sheng tie jiao jue
Plants ca. 30 cm tall. Rhizome erect, short, scaly; scales dark brown to black, narrowly triangular, entire. Fronds caespitose; stipe dull, dark grayish brown, 10-15 cm, with many dark brown, narrowly triangular to linear, fimbriate scales; lamina linear, 15-20 × ca. 3 cm, base truncate and slightly reduced, pinnatisect, apex acute; segments 15-18 pairs, lower segments opposite, upper ones subopposite to alternate, middle pinnae 1.5-2 × 0.5-0.8 cm, narrowly ovate to elliptic, base adnate to rachis, upper segments connected by narrow wing, margin repand to sinuate, apex obtuse. Costa and veins obscure, veins simple or forked, reaching to margin. Fronds herbaceous, greenish brown when dry, abaxially with small hastate-fimbriate scales; rachis dark brown, with many narrowly triangular to linear fimbriate scales. Sori 3 or 4 per pinna, linear, 4-8 mm, approximately median on subtending vein; indusia linear, margin entire, opening toward costa, persistent.
● Guangdong (only known from the type).
Asplenium adnatum has scales similar to those of A. crinicaule but has adnate and obtuse pinnae. It is probably either a hybrid or an allopolyploid taxon derived from that species.