30. Pyrrosia porosa (C. Presl) Hovenkamp, Blumea. 30: 208. 1984.
柔软石韦 rou ruan shi wei
Niphobolus porosus C. Presl, Tent. Pterid. 202. 1836; Cyclophorus acrocarpus (Christ & Giesenhagen) C. Christensen; C. alcicornu Christ; C. malacophyllus C. Christensen; C. pekinensis C. Christensen; C. porosus (C. Presl) C. Presl; C. sticticus (Kunze) C. Christensen; C. xiphioides (Christ) C. Christensen; N. acrocarpus Christ & Giesenhagen; N. sticticus Kunze; N. sticticus var. major Christ; N. xiphioides Christ; Polypodium mollissimum Christ (1899), not Fée (1866); P. porosum (C. Presl) Mettenius; P. sticticum (Kunze) Mettenius; Pyrrosia mollis (Kunze) Ching f. alcicornu (Christ) Ching; P. mollis var. mollissima Ching; P. porosa var. mollissima (Christ) K. H. Shing; P. scolopendrina Ching; P. stictica (Kunze) Holttum.
Plants 7-25 cm tall. Rhizome shortly elongated, 1.6-3.1 mm in diam., cross section with few to many sclerenchyma strands; phyllopodia 0.3-0.7 cm apart, lateral buds alternating with phyllopodia. Scales peltate, narrowly ovate to lanceolate, 1.4-6.8 × 0.5-2.1 mm, base entire to ciliate; acumen light brown to dull blackish with a distinct lighter margin, ciliate to dentate. Fronds monomorphic, sessile or indistinctly stipitate; lamina widest above middle, 10-23 × 0.7-2.5 cm, base gradually narrowed, apex acute to acuminate. Hydathodes distinct, superficial. Indument persistent, dimorphic, very sparse to dense, brown or lower layer whitish; hairs 0.2-1.6 mm in diam., with erect-spreading to appressed, acicular rays, usually ± mixed with hairs with mainly woolly rays. Sori superficial, without central bundle of paraphyses. Sporangia sessile or with stalks to as long as capsule.
On tree trunks or rocks in forests; 900-2600 m. Guangxi, Guizhou, Hainan, Sichuan, Taiwan, Xizang, Yunnan [Bhutan, India, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam].
The epithet "porosum" was introduced by Wallich as Polypodium porosum (Numer. List, no. 266. 1829, nom. nud.). Pyrrosia porosa has often been confused with P. mollis (Kunze) Ching from Indochina and Malesia. All references to P. mollis from China refer to P. porosa.
