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FOC | Family List | FOC Vol. 2-3 | Dryopteridaceae | Arachniodes

40. Arachniodes henryi (Christ) Ching, Acta Bot. Sin. 10: 258. 1962.

云南复叶耳蕨 yun nan fu ye er jue

Polystichum henryi Christ, Notul. Syst. (Paris) 1: 36. 1909; Byrsopteris henryi (Christ) C. V. Morton; Dryopteris henryi (Christ) C. Christensen; Rumohra henryi (Christ) Ching.

Rhizome creeping, succulent at growing apex, 3-5 cm in diam., moderately scaly; scales pale brown, ovate-lanceolate or lanceolate, 5-8 × 1-3 mm, apically attenuate or hairlike, margin entire (or remotely denticulate), thin and soft. Fronds remote or approximate, 0.8-1.2(-1.5) m; stipe stramineous, 45-65 cm, 4-6 mm in diam., base scaly as rhizome, upward diminishing to glabrescent; lamina 4(or 5)-pinnate-pinnatifid, shiny green when dried, ovate-deltoid or ovate-oblong, 40-60 × 30-45 cm, thinly herbaceous, base rounded, apex acuminate, rachis glabrescent; stalked pinnae ca. 15 pairs, alternate, (obliquely) spreading; lowest pinnae ovate-deltoid, to 38 × 25 cm, base rounded-cuneate, apex acuminate; primary pinnules ca. 20 pairs, deltoid-lanceolate, basal basiscopic ones slightly elongated, to 18 × 8 cm, base rounded-cuneate, apex acuminate; secondary pinnules to 15 pairs, ovate, to 5 × 3 cm, base rounded, apex obtuse, proximal ones 2-pinnate-pinnatifid in larger fronds; tertiary pinnules ovate-oblong, shortly stalked or sessile, ca. 1.5 × 0.8 cm, base cuneate, apex obtuse, margin deeply pinnatifid (with proximal 1 or 2 pairs of lobes free), lobe sharply dentate, teeth blunt tipped; upper pinnae gradually reduced; axes and veins of ultimate segments occasionally with a few minute brown subulate or hairlike scales abaxially. Sori small, terminal (or subdorsal) on veinlets, 1-3 pairs per ultimate segment, medial between midvein and margin; indusium pale brown, membranous, and entire (or crenulate).

Dense woods in valleys, on slopes by streams in forests, sometimes on ridges in montane rain forests; (800-)1000-1500 m. S Yunnan [Myanmar, Thailand, N Vietnam].


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