假友水龙骨 jia you shui long gu

Polypodium subamoenum C. B. Clarke, Trans. Linn. Soc. London, Bot. 1: 550. 1880; Goniophlebium subamoenum (C. B. Clarke) Beddome.

Rhizome long creeping, 2-3 mm in diam., densely covered with scales; scales brown or dark brown, ovate-lanceolate, broad at base, peltate, margin entire, apex acuminate. Fronds remote. Stipe stramineous, 5-10 cm, glabrous. Lamina pinnatipartite, ovate-lanceolate in outline, 15-20 × 5-8 cm, base cordate, apex caudate. Segments 10-15(-20) pairs, linear, 3-4 cm × 8-10 mm, margin double-serrate, apex obtuse or acute; lowest pairs shorter and deflexed. Veins visible, anastomosing to form 1 row of areoles along rachis and 1 or 2 rows of areoles on each side of costa, costal areoles containing a simple included veinlet. Lamina herbaceous, green, abaxial surface scaly, adaxial surface glabrous. Sori orbicular, in 1 row on each side of costa, terminal on included veinlets, close to costa.

Epiphytic on tree trunks or on rocks; 2400-3300 m. Xizang, Yunnan [N India, Nepal].

Polypodium intermedium Ching & S. K. Wu ex K. H. Shing (Acta Phytotax. Sin. 31: 574. 1993 ["intermeldium"]), described from Yunnan, was compared in the protologue with P. subamoenum (Polypodiodes subamoena).