叶基宽铁角蕨 ye ji kuan tie jiao jue

Davallia pulcherrima Baker, Bull. Misc. Inform. Kew 1895: 53. 1895; Asplenium billetii Christ; A. calcicola Tagawa.

Plants 10-25 cm tall. Rhizome erect, apex scaly; scales dark brown to black, narrowly triangular to linear-subulate, margin fimbriate to subentire. Fronds caespitose; stipe shiny, purplish black, 6-18(-25) cm, terete, rigid and threadlike, with brown, multicellular uniseriate hairs or subglabrous; lamina deltoid-triangular, 6-15 × 3-7(-9) cm, base truncate, (3 or)4-pinnate, apex acuminate; pinnae (8-)12-16 pairs, subopposite to alternate, overlapping, stalk up to ca. 1.3 mm and dark brown abaxially, basal pinnae largest, triangular to ovate, 2-5 × 0.7-2 cm, base auriculate-truncate, tripinnate, apex obtuse to subacute; pinnules 6-10 pairs, anadromous, basal acroscopic pinnule largest, triangular-ovate, 5-12 × 5-8 mm, stalk up to ca. 1 mm, base asymmetrical, acroscopic side truncate, basiscopic side cuneate, apex obtuse, 2-pinnate; ultimate segments 2-4 pairs, basal acroscopic segment most developed, 2-4 × 2-4 mm, 2- or 3-partite (fertile) or simple (sterile) and linear-subulate, ultimate fertile segments 0.5-1.5 mm wide, ultimate sterile segments 0.2-0.4 mm wide, apex acute. Costa and costules sulcate adaxially, green, veins slightly raised or flat adaxially, anadromous, 1 vein per segment, terminal hydathode not reaching margin. Fronds firmly herbaceous, green, lamina with multicellular uniseriate hairs or subglabrous; rachis shiny purplish black, becoming green in upper half toward apex, sulcate adaxially, with brown, multicellular uniseriate hairs or subglabrous. Sori 1 per fertile, forked and pouch-shaped segment, median on acroscopic veinlet, often spreading and obscuring indusium at maturity, oval, 1-1.5 mm; indusium white or gray, semi-elliptic, membranous, hyaline, entire, opening toward costules and margin, persistent. Spores brown to dark brown, lophate (cristate-alate) perispore. Plants tetraploid: 2n = 144.

On rocks in open areas, on rocks in forests; 300-1800 m. Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Sichuan, Taiwan, Yunnan [Malaysia (Sarawak), Vietnam].

Plants of Asplenium pulcherrimum are tetraploid, but further study will have to show if they are sexual or agamosporous. Due to confusion with the preceding species, A. coenobiale (e.g., H. S. Kung, Fl. Sichuan. 6: 375. 1989; L. K. Lin, Fl. Fujian. 1: 129. 1991; P. S. Wang & X. Y. Wang, Ching Mem. Vol. 79. 1999; Pterid. Fl. Guizhou, 123. 2001; S. H. Wu, FRPS 4(2): 115. 1999; T. L. Wu et al., Fl. Guangdong 7: 201. 2006), its distribution is not well known.