Family

Polypodiaceae

Nomenclature

Pyrrosia lingua (Thunb.) Farw., Amer. Midl. Naturalist 12: 302. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 508. 1941; Hovenkamp, Leiden Bot. Ser. 9: 203. 1986; Boonkerd & Pollawatn, Pterid. Thailand: 286. 2000; Newman et al., Checkl. Vasc. Fl. Lao PDR: 30. 2007. – Acrostichum lingua Thunb., Fl. Jap.: 330. 1784. – Polypodium lingua (Thunb.) Sw., Syn. Fil.: 29. 1806. – Nipholobus lingua (Thunb.) Spreng., Syst. Veg. 4: 45. 1827. – Polycampium lingua (Thunb.) C.Presl, Epimel. Bot.: 136. 1851.

Description

Rhizome long creeping; scales with marginal cilia. Fronds simple. Stipes 1.5–25 cm long. Laminae oblong-lanceolate, oblong, ovate or elliptic, apex obtuse to acuminate, base cuneate, 5–23 by 1.2–2.5 cm, coriaceous, the margin of fronds often involute, fertile fronds hardly different; midrib and main veins distinct, raised beneath, other veins hardly visible, anastomosing; rigidly coriaceous, upper surface stellate hairy or glabrescent, with scattered hydathodes, the lower surface densely covered with stellate hairs, light to greyish brown. Sori round, distinct, scattered on all the lower surface or in upper part of it, embedded in stellate hairs, not confluent .

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai.

Distribution in Laos

Khammouane.

Wider Distribution

NE India, China, Japan, Korea, Indochina.

Ecology

Epiphytic on tree trunks.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threat.

Voucher specimens - Thailand

Middleton et al. 5013, Chiang Mai, Doi Chiang Dao Wildlife Sanctuary (E).