薄叶轴脉蕨 bao ye zhou mai jue

Polypodium dissectum G. Forster, Fl. Ins. Austr. 81. 1786; Aspidium membranifolium (C. Presl) Kunze; Ctenitis angustodissecta (Hayata) H. Itô; C. dissecta (G. Forster) H. Itô; C. sasakii (Hayata) Ching; C. tenuifrons Ching; Ctenitopsis angustodissecta (Hayata) Ching; C. dissecta (G. Forster) Ching; C. membranifolia (C. Presl) Ching; C. sasakii (Hayata) Ching & Chu H. Wang; C. subfuscipes Tagawa; Dryopteris angustodissecta Hayata; D. dissecta (G. Forster) Kuntze; D. sasakii Hayata; D. tenuifrons Hayata (1914), not C. Christensen (1905); Lastrea dissecta (G. Forster) Carruthers; Nephrodium dissectum (G. Forster) Desvaux; N. membranifolium C. Presl; Tectaria subfuscipes (Tagawa) C. M. Kuo.

Plants terrestrial, ca. 1 m tall. Rhizome erect, short, ca. 1 cm in diam., densely scaly at apex; scales brown with narrow paler margin, glossy, lanceolate, ca. 4 mm, membranous, entire, apices acuminate. Fronds clustered; stipe deep stramineous to brown, ca. 40 cm, 4-5 mm in diam. at base, grooved above, with sparse light brown articulate hairs, lower part clothed with brown scales similar to those of rhizome. Lamina tripinnatifid, bipinnatifid toward apex, brown when dried, triangular-ovate or elliptic-ovate, 50-60 × 30-40 cm, thinly papery, adaxially with sparse brown articulate hairs, base subcordate, apex acuminate; rachises, costae, and main veins brown, clothed with brown articulate hairs; pinnae 6-8 pairs, subopposite on lower part and alternate upward, interval ca. 2 cm; basal pair of pinnae largest, obliquely triangular, 16-20 × 12-16 cm, acuminate, stalks 8-10 mm (subsessile upward), pinnatifid to forming pairs of separate large pinnules; middle pinnae lanceolate, 15-18 × 5-6 cm, bases cuneate, apices long acuminate, pinnatipartite to 3/4 way toward costa, occasionally with subseparate pinnules; basal basiscopic pinnules lanceolate, 10-12 × 2.5-3 cm, bases cuneate, apices acuminate, pinnatipartite; lobes 10-12 pairs, interval 2-2.5 mm, light upward, oblong, 15-17 × 6-7 mm, obtuse, scalloped. Veins pinnate, free, veinlets forked. Sori orbicular, terminal on veinlets; indusia light brown, orbicular-reniform, hairy, entire, persistent.

Forests; 100-600 m. Taiwan [India; SE Asia to Polynesia].

Knapp (Ferns Fern Allies Taiwan, 221. 2011) treats Tectaria subfuscipes as a distinct species, distinguished by the black stipe scales, the lamina bipinnatifid to the middle with only the lowest pinnae with free pinnules (if any at all), and the rachis and costae with only a few ctenitoid hairs abaxially.