Family

Tectariaceae

Nomenclature

Tectaria decurrens (C.Presl) Copel. in Elmer., Leafl. Philipp. Bot. 1: 234. 1907; Ching, Sinensia 2: 22. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 406. 1941; Holttum, Dansk Bot. Ark. 23: 242.1965; Holttum, Rev. Fl. Malaya, ed. 2, ed. 2.2: 635. 1968; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 99. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 372. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 90. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 212. 2000. – Aspidium decurrens C.Presl, Rel. Haenk. 1: 28. 1825; Bedd., Handb. Ferns Brit. India: 219, f. 113. 1883. – Type: Haenke s.n., Philippines, Luzon (PRC).

Description

Rhizome short, erect, densely scaly; scales brown, stiff, with paler ferrugineous margins, up to 13 by 2 mm. Stipes up to 60 cm long, scaly on lower part, glabrescent above, winged nearly to the base. Laminae pinnate, oblong in outline, up to 55 by 33 cm; rachis winged throughout; lateral pinnae 2–7 pairs, the basal ones ascending, lanceolate, caudate at apex, subentire or crenulate, gradually narrowing towards base, each bearing a large basal acroscopic lobe, lanceolate, subentire, caudate at apex, up to 15 by 3 cm; upper pinnae lanceolate, caudate at apex, gradually narrowing towards base and decurrent to the wings of rachis, up to 25 by 3 cm in fertile and 5 cm broad in sterile ones, subentire or shallowly crenulate, apical pinna broader; papyraceous, deep green, glabrous on both surfaces; costa and main veins raised beneath, veinlets forming areoles, cross-veins not so distinct. Sori rather close to main veins, two rows between adjacent main veins, lamina often raised on upper surface above sori; indusia up to 1.2 mm diam., persistent, glabrous .

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai, Nan, Phrae, Phitsanulok; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; SOUTH-EASTERN: Trat; PENINSULAR: Surat Thani, Krabi, Nakhon Si Thammarat.

Distribution in Laos

Vientiane.

Wider Distribution

Widely in tropical Asia, east to Polynesia, north to Taiwan and the Ryukyus.

Ecology

On mountain slopes usually in dense forests at medium altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4648, Trat, Khlong Kaew National Park (E); Middleton et al. 5522, Nakhon Si Thammarat, Khao Luang National Park (E).

Voucher specimens - Laos

Maxwell 99-192, Vientiane (CMU)