爪哇蕗蕨 zhao wa lu jue

Mecodium javanicum (Sprengel) Copeland.

Rhizome long creeping, wiry, slender, ca. 0.5 mm in diam., laxly branched, with rather sparse brownish hairs. Stipes remote, naked but very base hairy, 2-5 cm, winged except near base; wings becoming broader upward, entire, ± crisped at edge. Rachis straight or zigzag in very upper portion, winged like upper portion of stipe. Lamina tripinnate to quadripinnatifid, oblong-subdeltoid, 4-7(-15) cm, 3-4(-7) cm wide at widest basal portion, glabrous, apex ± acute; pinnae 5 or more pairs, basal ones oblong-subdeltoid, up to 3 × 2 cm, base broadly cuneate to rounded, shortly stalked, apex moderately acute to rounded; upper ones gradually becoming smaller upward, oblong in outline; pinna rachis like rachis, ± zigzag throughout; ultimate segments up to 4 mm, narrow, 0.6-1 mm wide, decurrent into every axis forming distinct, wavy or crisped wings ca. 0.8 mm in width, margin entire but undulate or crisped, apex rounded to obtuse; internal cell walls thin, straight. Sori scattered usually on apical parts of pinnae; involucres bivalvate, deeply cleft to base; valves subdeltoid to oblong, 1.2-1.6 mm, up to 1 mm wide, lips finely toothed; receptacles wholly included within involucres, clavate to filiform. 2n = 72.

Epiphytic on moss-covered tree trunks in dense tropical evergreen forests; 1400-2100(-2300) m. E, ?NC, and S Taiwan [India, Indonesia, Malesia, Myanmar, Sri Lanka, Thailand, Vietnam; Australia, Pacific islands (Melanesia, Micronesia, Polynesia)].