Description from Flora of China
Niphobolus bonii Christ ex Giesenhagen, Niphobolus, 120. 1901; Cyclophorus bonii (Christ ex Giesenhagen) C. Christensen; Pyrrosia shennongensis K. H. Shing; P. subtruncata Ching.
Plants 30-50 cm tall. Rhizome short or occasionally shortly elongated, 2-6.8 mm in diam., in cross section with many scattered sclerenchyma strands; phyllopodia contiguous or up to 2.5 cm apart, lateral buds on or close to phyllopodia. Scales pseudopeltate, 6.5-11 × 0.7-1.3 mm, base entire to ciliate; acumen dull brown, ciliate. Fronds monomorphic, stipitate; stipe 4-31 cm, (0.1-)0.2-1 × as long as lamina; lamina widest at ca. middle, 15-30 × 3.5-4.5 cm, base usually symmetrical, cuneate and slightly decurrent, apex shortly acuminate. Hydathodes distinct, superficial. Indument persistent or fugacious, dimorphic, thin or occasionally dense, dirty grayish; upper layer with hairs 0.8-1.3 mm in diam., with erect-spreading, acicular rays, ± mixed with a lower layer with mainly woolly rays. Sori superficial, without central bundle of paraphyses. Sporangia with stalks 1-1.5 × as long as capsule.
On rocks in forests; 300-1100 m. Guangxi, Guizhou [Vietnam].