河口实蕨 he kou shi jue

Rhizome robust and shortly creeping, 1-1.5 cm in diam., densely scaly; scales dark brown, lanceolate, ca. 4 mm, margin entire. Fronds close together, 28-51 cm; sterile fronds pinnate; stipe pale brown, 8-17 cm, base ca. 3 mm in diam., grooved adaxially, densely covered with lanceolate, brown scales; lamina grayish brown when dry, elliptic, 18-32 × 9.5-15 cm, thickly papery, apical part pinnatipartite into lanceolate lobes, bulbil subterminal; rachis not winged, densely covered with lanceolate, brown scales especially when young; pinnae 6-10 pairs, lanceolate, 6.5-12 × 1.2-2 cm, base rounded, margin crenate-serrate, sometimes with an obtuse tooth in each sinus, apex long acuminate, basal pairs subopposite, with short stalk 2-3 mm; secondary veins inconspicuous; veins forming 3 rows of long and narrow areoles, without included free veinlets. Fertile fronds as long as sterile fronds; lamina obviously narrower, linear-lanceolate; pinnae subsessile, 3-4 × ca. 5 mm, base rounded-cuneate, margin entire, apex acuminate. Sporangia inserted throughout abaxial surface.

● Rocky limestone crevices in rain forests; 400-1100 m. Hainan, Yunnan.