毛轴牙蕨 mao zhou ya jue

Pteridrys nigra Ching & Chu H. Wang.

Plants 0.7-1.5 m tall. Rhizome creeping. Stipe dark stramineous or brown, 0.3-0.6 m, densely scaly at base; rhizome and basal stipe scales lanceolate, 5-7 × 1-2 mm. Lamina 2-pinnatifid, 0.4-0.8 × 0.2-0.3 m; lateral pinnae 12-15 pairs; basal pinnae longest or shortest, lanceolate, 9-27 × 3-5 cm, lobed 1/2-2/3 toward costule, stalks 1-4 mm, basal basiscopic lobes, slightly shortened, entire; pinna lobes 20-26 pairs, 1.5-2 × 0.5-0.8 cm, margins slightly serrate, with a sharp tooth in each sinus, obtuse at apex; lamina thickly papery, brown when dried; costae with short hairs on abaxial surface; veins free, veinlets 8-10 pairs on each lobe, 2- or 3-furcate. Sori terminal on veinlets, 5-7 pairs on each lobe; indusia with long hairs, fugacious.

Forests along streams; 100-700 m. Guangdong, Yunnan [Laos, Malaysia, Myanmar, Thailand, Vietnam].