滇越水龙骨 dian yue shui long gu

Polypodium bourretii C. Christensen & Tardieu, Notul. Syst. (Paris) 8: 183. 1939; Goniophlebium bourretii (C. Christensen & Tardieu) X. C. Zhang; P. wangii Ching (1949), not C. Christensen (1934).

Rhizome long creeping, ca. 4 mm in diam., densely covered with scales; scales light brown, linear-subulate, clathrate, ca. 10 mm, broad at base with minutely serrate margin, upper part acuminate with entire margin, apex hairlike. Fronds remote. Stipe straw-colored, 10-15 cm, slender, glabrous. Lamina pinnatipartite, pinnatifid-acuminate at apex, oblong-lanceolate in outline, 20-40 × 8-14 cm, base cordate and slightly narrowed. Segments 20-30 pairs, linear-lanceolate, 4-7 cm × 6-8 mm, base broad and connected by narrow wings along midrib, margin remotely incised, apex acute; basal pair subdeflexed and slightly shorter than next upper pairs. Veins anastomosing to form 1 row of areoles on each side of costa and of rachis. Lamina herbaceous, grayish green, adaxial side sparsely covered with long, appressed, septate, whitish hairs, abaxial side densely pubescent with short hairs. Sori orbicular, in 1 row on each side of costa, closer to costa.

Epiphytic on tree trunks or on rocks; 600-1500 m. S Guizhou, SE Yunnan [Vietnam].