Family

Polypodiaceae

Nomenclature

Leptochilus pedunculatus (Hook. & Grev.) Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes : 62. 2008. – Ceterach pedunculatum Hook. & Grev., Icon. Filic.: t. 5. 1827. – Selliguea pedunculata (Hook. & Grev.) C.Presl, Epimel. Bot.: 146. 1851. – Gymnogramma hamiltoniana Hook., Sp. Fil. 5: 161. 1864. – Selliguea hamiltoniana (Hook.) Bedd., Ferns Brit. India: t. 239. 1867; Bedd., Handb. Ferns Brit. India: 390, f. 226. 1883. – Pleopeltis pedunculata (Hook. & Grev.) Alderw., Malayan Ferns Fern Allies. Suppl. 1: 405. 1917. – Colysis pedunculata (Hook. & Grev.) Ching, Bull. Fan Mem. Inst. Biol. 4: 321. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 492. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 160, f. 71. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 230. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 76. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 55. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 538. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 246, 247, 265. 2000. – Leptochilus macrophyllus var. pedunculatus (Hook. & Grev.) Noot., Blumea 42: 290. 1997; Noot., Fl. Males., Ser. II, Ferns and Fern Allies 3: 88. 1998. – Colysis macrophylla C.Presl var. pedunculata (Hook. & Grev.) S.Linds., Edinburgh J. Bot. 66(2): 356. 2009. – Type: Wallich 9 (K), India.

Polypodium wui C.Chr., Bull. Dept. Biol. Sun Yatsen Univ. 13: 17. 1933. – Colysis wui (C.Chr.) Ching, Bull. Fan Mem. Inst. Biol. 4: 322. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 494. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 55. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 539, f. 54.3. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 266. 2000.

Description

Rhizome long creeping, 2–5 mm wide, very dark, bearing fronds usually 1–3 cm apart, scaly; scales pseudopeltate, narrowly subtriangular, gradually narrowing from base towards tapered acuminate apex, 2.5–4 by 0.5–0.8 mm, dark greyish-brown, clathrate, toothed at margin. Fronds dimorphic. Sterile fronds: stipes 0–10 cm long, narrowly winged nearly to the base; laminae oblong, usually gradually narrowing towards acute to acuminate apex, round to cuneate at base, up to 14–35 by 2–8.5(–10) cm; main lateral veins distinct, up to 1.2 cm apart, the veins forming areoles with included veinlets; herbaceous, green, dark in dried specimens. Fertile fronds: stipes 13–30(–45) cm long, stramineous, wingless; laminae broadly oblong, broadest at middle portion, narrowing towards acute apex, round at base, 4–10(–24) by 1–3.5(–5) cm broad. Sori up to 4 mm broad, extending over almost all the lower surface except on midrib and lateral main veins. Spores monolete .

Distribution in Thailand

NORTHERN: Chiang Mai; SOUTH-WESTERN: Phetchaburi; SOUTH-EASTERN: Chon Buri, Chanthaburi; PENINSULAR: Surat Thani, Krabi, Nakhon Si Thammarat, Trang, Satun.

Distribution in Laos

Champasak.

Wider Distribution

N India, SW China (Yunnan), Burma, Vietnam, Peninsular Malaysia, Sumatra, Java.

Ecology

On moist or damp rocks in stream-beds or in deep shade or climbing on basal tree trunks in dense evergreen forests at low to medium altitudes.

Proposed IUCN Conservation Assessment

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