7. Lygodium microphyllum (Cavanilles) R. Brown, Prodr. 162. 1810.
小叶海金沙 xiao ye hai jin sha
Ugena microphylla Cavanilles, Icon. 6: 76. 1801; Lygodium scandens (Linnaeus) Swartz var. microphyllum (Cavanilles) Luerssen.
Rhizome long creeping, ca. 3 mm in diam., branching, covered with multicellular hairs 2-3 mm, lustrous black changing to reddish brown on fronds. Fronds 3-10 mm apart, climbing to 10-15 m. Stipes dark brown at base becoming stramineous, covered with reddish brown multicellular hairs, sparse distally, ca. 14 cm to first pinnae. Rachis ca. 1 mm in diam., narrowly grooved, glabrous to randomly hairy. Pinna stalk 3-6 mm, grooved, glabrous to sparsely hairy, hairs short, acicular extending onto pinna branch for a short distance. Dormant pinna bud prominent, covered with golden to reddish brown multicellular hairs. Primary pinna branches grooved, glabrous, pinnate, bearing 4(-7) alternate pairs of segments, terminal segments bifid or dichotomous. Segment stalk 2-4(-7) mm, articulate (segment deciduous leaving persistent stalk), articulation zone prominent at base of segment. Segments deltoid to lanceolate, rarely lobed, 1.5-2.5(-5.5) × 0.9-1.5(-2) cm, truncate to cuneate at base, rounded to acute at apex. Veins free, prominent abaxially, 2 or 3 times forked, ascending at 30°-40° from costa, ending at margin. Margins minutely crenulate-serrulate to subentire, slightly thickened. Fertile and sterile segments monomorphic to slightly dimorphic. Fertile segments smaller, 1-3 × 1-1.5 cm, articulation zone of stalk less prominent, hairs more common abaxially close to sorophores which extend from veins at margins, 4-6(-10) sporangial pairs per sorophore; indusia glabrous, margins crenulate; spores reticulate, laesurae not prominent.
Among shrubs by streams; low elevations (near sea level to 700 m in Taiwan). Fujian, Guangdong, Guangxi, Hainan, Taiwan, Yunnan [India, Indonesia, Malaysia, Myanmar, Nepal, Philippines; Africa, Australia, North America, S Pacific islands].