阔羽肠蕨 kuo yu chang jue

Allantodia brunoniana Wallich, Pl. Asiat. Rar. 1: 44. 1830; Asplenium brunonianum (Wallich) Mettenius; Diplaziopsis hainanensis Ching.

Rhizome erect, apex like base of stipe, with brown, entire, lanceolate scales; roots long, wiry, fleshy; fronds caespitose. Fertile frond up to 1.5 m; stipe black-brown at base, upward brown, 15-40 cm, 2-5 mm in diam., glabrous; lamina elliptic, 15-100 × 15-35 cm; lateral pinnae 1-14 pairs, alternate or subopposite, base subsessile or slightly adnate to rachis, obliquely ascending, elliptic, broadly lanceolate, or suboblong, 11-20 × 2.5-5.5 cm, base rounded-cuneate or shallowly cordiform, margin entire, apex abruptly narrowed to caudate (tail up to 2.5 cm); apical pinnae similar to lateral pinnae, often large, ca. 23 cm, base often asymmetrical, stalk up to 2 cm; basal pinnae short; veins prominent, anastomosing with 2-4 rows of areoles, 2-furcate at costa, rarely near costa, oblique, vein endings free inframarginally or connected by inframarginal veinlets. Lamina submembranous when dry, dark green adaxially, green abaxially. Sori thick, linear, up to 1.5 cm, close to costa, ca. 4 mm apart, borne on acroscopic vein of 2-furcate vein, basiscopic veinlet sterile; indusia sausage-shaped, thick but thinly membranous when young, wrapping all sporangia, ruptured irregularly from back surface or opening acroscopically, persistent.

Guizhou (Chishui), Hainan, Taiwan, Yunnan [India, Nepal, Philippines, Vietnam].

Many authors treat Diplaziopsis brunoniana as a synonym of D. javanica (e.g., Christenhusz et al., Phytotaxa 19: 48. 2011). Diplaziopsis hainanensis is based on a tiny specimen of D. brunoniana.