纸质石韦 zhi zhi shi wei

Polypodium heteractis Mettenius ex Kuhn, Linnaea 36: 140. 1869; Cyclophorus heteractis (Mettenius ex Kuhn) C. Christensen; C. heteractis var. minor C. Christensen; Niphobolus heteractis (Mettenius ex Kuhn) J. Smith; Pyrrosia fuohaiensis Ching & K. H. Shing; P. heteractis var. minor (C. Christensen) Ching; P. latifolia Ching & S. K. Wu; P. lingua (Thunberg) Farwell var. heteractis (Mettenius ex Kuhn) Hovenkamp.

Plants 10-30 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, usually distinctly spreading, 5-9.5 × 0.9-2 mm, base dark at attachment, entire to irregularly dentate; acumen shiny, light brown, with long, curly marginal as well as superficial cilia; short, ± ovate scales occasionally present. Fronds weakly dimorphic, stipitate. Sterile fronds: stipe 4-14 cm; lamina widest at or below middle, 14-25 × 4-7.5 cm, base truncate to ± cuneate, apex acuminate or occasionally apiculate. Fertile fronds similar or somewhat narrower. Hydathodes distinct, ± superficial. 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, rocks, and rocky crevices in forests; 1200-2600 m. Guangxi, Hainan, Sichuan, Xizang, Yunnan [Bhutan, India, Myanmar, Thailand, Vietnam].

The Chinese specimens of Pyrrosia heteractis are distinct from P. lingua in the wider and distinctly more spreading rhizome scales and the often wider lamina.