Description from Flora of China
Cyclophorus eberhardtii Christ, J. Bot. (Morot), ser. 2, 1: 270. 1908; Pyrrosia oblonga Ching.
Plants 6-20 cm tall. Rhizome long creeping, 1.2-3.7 mm in diam., in cross section with a few sclerenchyma strands; phyllopodia (0.5-)2-8 cm apart, lateral buds alternating with phyllopodia. Scales peltate, (5-)7-8(-9.5) × 0.9-1.6 mm, base entire to irregularly dentate; acumen shiny, light brown, with long, curly marginal as well as superficial cilia. Fronds subdimorphic, stipitate. Sterile fronds: stipe 4-12 cm; lamina widest at or below middle, 4-12 × 2-3 cm, base cuneate, apex obtuse to rounded. Fertile fronds longer and narrower. Hydathodes distinct, ± superficial, rarely distinctly sunken or absent. Indument persistent, dimorphic, dense, whitish to grayish brown; upper layer with hairs 0.4-0.8 mm in diam., with appressed, boat-shaped rays, lower layer with woolly rays. Sori superficial, without central bundle of paraphyses. Sporangia with stalks 0.75-1 × as long as capsule.
On tree trunks or rocks in forests; 1000-1700 m. ?Guangdong, Hainan [Thailand, Vietnam].