网脉海金沙 wang mai hai jin sha

Lygodium subareolatum Christ.

Plants climbing up to 5 m. Rachis of scandent fronds up to 5 mm in diam., minutely hairy; primary rachis branches very short, dormant apices prominent, covered with long dark brown hairs; secondary rachis branches unifoliate and sterile near base of a frond, upper ones pinnate; unifoliate secondary branches 6-9 cm, pinnae ca. 25 cm, palmately 5- or 6-lobed with acute sinuses to within 6 cm of base, lobes 2.5-4 cm wide, abaxial surface of lamina and veins minutely hairy or glabrous, veins oblique, anastomosing, with ca. 4 rows of elongate areoles between costa and margin, margin not thickened and shallowly and irregularly crenate-serrate (or thickened and serrate to serrulate), apex acute and acuminate; largest upper sterile secondary rachis branches pinnate, with 2-4 lateral deeply bilobed or palmate pinnae (on stalks up to 3 cm) and a terminal one; fertile secondary rachis branches pinnate (or largest bipinnate at base), in all ca. 30 cm or longer, with 5-7 pinnae 2-4- lobed; fertile pinnae 8-10 cm, lamina of each lobe up to ca. 1.5 cm wide, veins anastomosing, stalks 5-15 mm; sorophores 7-15 mm, somewhat contracted at base; indusia glabrous or with few pale hairs; spores very coarsely and irregularly verrucose, verrucae forming ridges with prominent laesurae and proximal equatorial ridge.

Forests, climbing on tree trunks at forest margins, often in limestone regions; 300-700 m. Guizhou, Hainan [Indonesia, Philippines, Vietnam].