腺脉毛蕨 xian mai mao jue

Aspidium opulentum Kaulfuss, Enum. Filic. 238. 1824; Amphineuron opulentum (Kaulfuss) Holttum; Aspidium extensum Blume; Cyclosorus extensus (Blume) H. Itô; Dryopteris extensa (Blume) Kuntze; Nephrodium extensum (Blume) T. Moore; N. opulentum (Kaulfuss) C. Presl; Thelypteris extensa (Blume) C. V. Morton; T. opulenta (Kaulfuss) Fosberg.

Plants 60-100 cm tall. Rhizomes shortly creeping, apices and bases of stipes with dark brown linear-lanceolate scales. Fronds approximate; stipes ca. 30 cm, brownish; laminae 30-60 × 20-30 cm, bases not narrowed or slightly so, apices caudate; pinnae 10-20 pairs, almost sessile; proximal pair of pinnae slightly shortened; middle pinnae linear-lanceolate, 15-25 × 1-2 cm, bases rounded-truncate (or slightly cuneate on proximal pinnae), lobed 1/2-2/3 toward costae, apices long acuminate; segments 25-40 pairs, middle ones subfalcate, 4-8 × 2-3 mm, entire, subacute to obtuse at apices; veinlets 8-10 pairs, proximal pair anastomosing or only connivent, sometimes next vein running to sinus membrane. Laminae herbaceous, yellowish green when dried, with several acicular hairs along veins on both surfaces, minute hairs and many minute yellow spherical glands along veins abaxially, also minute hairs between veins abaxially. Sori orbicular, submarginal, usually sterile on proximal 1 or 2 pairs of veins; indusia glabrous or glandular along margins. Sporangia bearing golden spherical glands on stalks. Spores cristate.

Streamsides in forests or thickets; 100-300 m. Hainan [S India, Indonesia, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand; E Africa, tropical America, N Australia, Micronesia].