长叶巢蕨 chang ye chao jue

Asplenium colaniae Tardieu; A. nidus Linnaeus var. phyllitidis (D. Don) Beddome; A. nidus var. simonsianum (Hooker) Christ; A. simonsianum Hooker; Neottopteris phyllitidis (D. Don) J. Smith; N. simonsiana (Hooker) J. Smith; Thamnopteris orientalis C. Presl; T. phyllitidis (D. Don) C. Presl; T. simonsiana (Hooker) T. Moore.

Plants (50-)70-110 cm tall. Rhizome erect, thick and short, woody, apex with scales; scales brown to blackish brown, triangular to ovate, membranous, entire or fimbriate. Fronds caespitose; stipe pale brown to grayish brown, 3-7 cm, woody, abaxially terete, broadly grooved adaxially when dry, glabrous, with 2 lateral ridges, base with scales similar to those on rhizome; lamina narrowly lanceolate to lanceolate, (48-)70-105 × 5-8 cm, widest at middle and gradually decurrent toward base, margin entire, apex acute to caudate. Midrib semiterete and grayish to yellowish pale brown abaxially, broadly grooved and pale yellowish brown adaxially when dry, glabrous; veins faintly visible, forked, or simple. Fronds papery or thinly leathery, brownish green when dry, glabrous. Sori linear, 2-3 cm, on acroscopic veinlets, from close to midrib to 1/2-3/4 as long as subtending veinlet, lower part of lamina usually sterile; indusia brownish, linear, membranous, entire, persistent. Spores with lophate (areolate-fenestrate) perispore. Plants tetraploid: 2n = 144.

On rocks or tree trunks in forests by streamsides; 600-1400 m. Guangxi, Guizhou, Hainan, Sichuan, Xizang, Yunnan [Bangladesh, Bhutan, India, Indonesia, Malaysia, Myanmar, Nepal, New Guinea, Thailand].

Asplenium simonsianum and A. colaniae are reduced to synonymy. Their types have a lamina 3-5 cm wide; we consider them extremely narrow forms of A. phyllitidis. The perispores of A. phyllitidis, A. simonsianum, and A. colaniae are closely similar and areolate-fenestrate.