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FOC | Family List | FOC Vol. 2-3 | Pteridaceae | Onychium

1. Onychium siliculosum (Desvaux) C. Christensen, Index Filic. 469. 1906.

金粉蕨 jin fen jue

Pteris siliculosa Desvaux, Mag. Neuesten Entdeck. Gesammten Naturk. Ges. Naturf. Freunde Berlin 5: 324. 1811; Acrostichum viviparum Cavanilles (1802), not Linnaeus f. (1782); Allosorus auratus (Kaulfuss) C. Presl; Cryptogramma aurata (Kaulfuss) Prantl; Onychium auratum Kaulfuss; O. chrysocarpum (Hooker & Greville) C. Christensen; O. siliculosum var. chrysocarpum (Hooker & Greville) Tardieu & C. Christensen; O. tenue Christ; Pteris aurata (Kaulfuss) Mettenius; P. chrysocarpa Hooker & Greville.

Rhizomes erect or ascending, short; scales dark brown, linear-lanceolate. Fronds somewhat dimorphic (fertile fronds with longer, broader segments), clustered. Stipe (5-)12-30 cm × 1-5 mm, straw-colored above a brown base, brown color sometimes extending abaxially to rachis. Lamina of sterile fronds ovate-deltoid to narrowly ovate-deltoid, 2- or 3-pinnate-pinnatifid, apex acuminate, papery when dry, green to grayish green, not farinose. Lamina of fertile fronds ovate-lanceolate to oblong-ovate, (5-)15-35 × 9-18 cm, 3- or 4-pinnate or rarely 2-pinnate-pinnatifid, with long, linear, simple, terminal segments; lateral pinnae (4-)10-15 pairs, basal pair slightly largest, oblong-lanceolate or deltoid, with stalks 3-6 mm. Ultimate segments of sterile lamina sometimes closely spaced but not overlapping, sessile, less than 1 mm wide at base, slightly wedge-shaped, apex wider and with 1-3 small teeth or narrowly notched, slightly thickened or recurved. Ultimate pinnules of fertile lamina not overlapping, linear when young, 5-15 × 1.5-2 mm, wider at maturity (2-3 mm), stalks 2-3 mm, base cuneate, apex acuminate or acute. Longest sori 10-20 mm or more, intermixed with bright yellow farina. False indusia linear, extending nearly to midvein, with entire margins. 2n = 58.

Rock crevices of dry valleys; 100-1500 m. E Hainan, Taiwan, Xizang, Yunnan [Bangladesh, Bhutan, Cambodia, India, Laos, Malaysia, Myanmar, Nepal, Thailand, Vietnam; Oceania].


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