光羽毛蕨 guang yu mao jue

Christella calvescens (Ching) Holttum; Cyclosorus sanduensis K. H. Shing & P. S. Wang; Thelypteris calvescens (Ching) C. F. Reed.

Plants 60-100 cm tall. Rhizomes shortly creeping, including stipe bases with dark brown lanceolate scales. Fronds approximate; stipes 20-50 cm, dark stramineous; laminae ovate-lanceolate, 40-60 × 20-35 cm, bases not narrowed or slightly so, apices caudate with a long apical pinna; lateral pinnae 10-15 pairs, middle ones 15-20 × 2-3 cm, bases cuneate (decurrent on proximal pinnae), shortly stalked, lobed 1/4-1/3 toward costae, apices long acuminate; proximal 1 or 2 pairs shortened to less than 1/2 length of middle pinnae or sometimes longer; segments 20-30 pairs on middle pinnae, triangular, entire, obtuse or subacute at apices; veinlets 8-10 pairs, proximal 1.5-2 pairs anastomosing, next 1.5-2.5 pairs running to sinus membrane. Laminae papery, grayish green or brownish green when dried, adaxially with sparse acicular hairs along costae and veins, abaxial surface subglabrous. Sori orbicular or elongate, medial; indusia subglabrous. Sporangia bearing orange or golden glands on stalks. Spores irregularly cristate or echinate.

Wet places in forests; 300-1600 m. Guangxi, S Guizhou, S Yunnan [Vietnam].