Volume 3 > Part 4 > Year 1989 > Page 506–507 > Polypodiaceae > Pyrrosia

18. Pyrrosia heteractis (Mett. ex Kuhn) Chingwfo-0001125760

Bull. Chin. Bot. Soc. 1: 57. 1935; Tagawa, J. Jap. Bot. 38: 327. 1963.– Polypodium heteractis Mett. ex Kuhn, Linnaea 36: 140. 1869.– Niphobolus heteractis (Mett. ex Kuhn) J.Sm., Ferns Br. For.: 296. 1877; Bedd., Handb. Fern Brit. India: 327. 1883. Fig. 50. 11–12.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Rhizome long-creeping, bearing fronds 1.5–5 cm apart, 2–3 mm diam., densely scaly throughout; scales patent, lanceolate to oblong-lanceolate, about 5 by 1.5 mm, concolorously brown, dark at peltately attached point, or bi-coloured with nearly black central portion, thin, bearing downy hairs at apical margin. Stipes 3–10 cm long, densely scaly at base with those like rhizome-scales, very densely covered throughout with grayish ferrugineous hairs and dark stellate hairs. Laminae ovate-oblong to elliptic rotundate at apex, round or shortly cuneate at base, 8–16 by up to 4.5 cm, the soriferous fronds hardly different form, or a little taller than, the sterile ones; coriaceous, midrib and main veins distinct on both surfaces, raised beneath, the other veins hardly visible, copiously anastomosing, the margin of fronds often involute; the upper surface stellate hairy or glabrecent, with dispersed brown hydathodes, the lower surface densely covered with hairs in two kinds, the lower layer grey ferrugineous hairs and needle-like arms. Sori round, large, distinct, densely arranged on the whole under surface.

Thailand : NORTHERN: Chiang Mai (Doi Pha Hom Pok), Tak (Doi Pae Poe), Phitsanulok (Phu Miang).

Distribution : Himalayas (type from Assam), Upper Burma, SW China (Yunnan).

Ecology : On mossy tree-trunks or on rocks at ridge in evergreen forests at high altitudes (1,400–2,000 m), rather rare.

Vernacular : Thao hin (เถาหิน)(Northeastern).

E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.