15. Arachniodes gigantea Ching, Bull. Bot. Res., Harbin. 6(3): 66. 1986.
高大复叶耳蕨 gao da fu ye er jue
Rhizome ascending, 8-10 cm in diam., apex densely scaly; scales reddish brown, narrowly lanceolate to threadlike, to 3.5 cm × 1.5-3 mm, often tortuous and soft. Fronds approximate, 1.2-1.7(-2.5) m; stipe stramineous, 60-90 cm, ca. 8 mm in diam., base tufted with scales similar to those on rhizome, lower parts moderately with subulate scales, these mixed with broadly lanceolate, remotely serrulate-margined thicker scales along both sides of adaxial groove, scales sparser upward; lamina (4 or)5-pinnate, dull greenish when dried, broadly ovate, 60-90 × 45-70 cm, thinly papery, base rounded, apex acuminate, rachis scaly as distal portion of stipe; pinnae ca. 20 pairs, alternate, with to 10 cm stalk, obliquely spreading; lower 1 or 2(-4) pairs ovate-deltoid, base rounded, apex acuminate; primary and secondary pinnules proximally broadly lanceolate and stalked, distally linear-lanceolate and sessile; tertiary pinnules shortly stalked or sessile, oblong, to 2.5 × 1 cm; quaternary pinnules 4 or 5 pairs, sessile, contiguous, oblong, 5-6 × 2-2.5 mm, base obliquely cuneate, apex sharply serrate; veins with a few minute brown subulate scales abaxially. Sori small, 2-4 pairs per ultimate segment, medial between midvein and margin; indusia dark brown, membranous, and entire.
● Wet slopes by streamlets in broad-leaved forests, forested deep valleys; 1100-1800 m. S and W Yunnan.