密毛穴子蕨 mi mao xue zi jue

Polypodium obliquatum Blume, Enum. Pl. Javae 2: 128. 1828; Cryptosorus obliquatus (Blume) J. Smith; Ctenopteris obliquata (Blume) Copeland; Grammitis obliquata (Blume) Hasskarl.

Stipe 0.6-5 cm, with hairs frequent to dense, short, simple and 1-forked, solitary, dark reddish brown, up to 0.4 mm. Lamina elliptic or narrowly elliptic, 10-30 × 2-4 cm, pinnate or deeply pinnately divided to narrow wing less than 0.5 mm wide along rachis, acuminate at apex, gradually shortened downward to form small deltoid or semicircular pinnae; middle pinnae largest, linear to linear-lanceolate, 10-27 × 1.8-2.7 mm, dilated at base, entire or slightly undulate, acute or obtuse at apex; rachis terete at least at base, distinctly prominent on both surfaces of lamina; costa of pinna ± prominent on both surfaces; veins hidden, simple; hairs simple, seldom tufted, sometimes 1-3-forked, dark reddish brown, up to 0.4 mm, sparse to dense on abaxial side of rachis, dense on adaxial side, occasional to scattered on margin, occasional to sparse on both sides of costae and lamina. Sori sunken in elliptic, oblique cavities on abaxial surface of lamina, prominent on adaxial surface, in a medial row on each side of costa, less than 8 pairs on 1 pinna, rim of cavity distinctly and evenly prominent, not fringed with hairs.

Epiphytic on tree trunks in dense wet forests, also on moss-covered rocks; 200-1800 m. Hainan, Taiwan [Borneo, S India, Indonesia, Malaysia, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam].