欧亚水龙骨 ou ya shui long gu

Rhizome long creeping, 3-4 mm in diam., densely scaly; scales pale brown, lanceolate with ovate peltate base, 4-5 mm, margin toothed, apex acuminate. Fronds remote. Stipe straw-colored, 5-10 cm, densely scaly at base, glabrescent upward. Lamina pinnatifid or pinnatisect, oblong-lanceolate in outline, 10-20 × 5-7 cm, herbaceous or subleathery, glabrous, apex shortly caudate. Segments 12-15 pairs, oblique, lanceolate, 3-4 × 0.5-0.8 cm, decurrent to adjacent lobes by very narrowly winged rachis, margin toothed, apex obtuse or acute. Veinlets hardly visible. Sori medial or slightly closer to costa.

Epilithic; ca. 1900 m. Xinjiang [Russia; Europe].

Available evidence demonstrates that Polypodium vulgare does not occur in Japan or North America.