Family

Polypodiaceae

Nomenclature

Lemmaphyllum accedens (Blume) Donk, Reinwardtia 2: 409. 1954; Holttum, Rev. Fl. Malaya ed. 1, 2: 152, f. 66. 1955 [‘1954’]; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 52. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 516, f. 52.1. 1989; Hovenkamp, Fl. Males., Ser. II, Ferns and Fern Allies 3: 73. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 272. 2000. – Polypodium accedens Blume, Enum. Pl. Javae: 121. 1828. – Pleopeltis accedens (Blume) T.Moore, Index Fil.: lxxvii. 1857; Bedd., Handb. Ferns Brit. India: 345. 1883. – Weatherbya accedens (Blume) Copel., Gen. Fil.: 191. 1947. – Type: Blume s.n. (L, BM), Java.

Description

Rhizome long creeping, slender, about 1 mm diam., bearing fronds remotely, scaly; scales narrowly subtriangular, gradually narrowing from base towards long-attenuate apex, up to 4 by 0.8 mm, clathrate, distinctly toothed at margin, pale brown. Fronds all sessile or nearly so, indistinctly dimorphic. Stipes 0–0.7 cm long. Sterile laminae ovate to ovate-oblong, round to moderately acute at apex, narrowly round to cuneate at base, 2–8(–10) by 1–3 cm; midrib prominent, veins obscure, copiously anastomosing; coriaceous, cartilaginous at margin. Fertile laminae to 17.5 cm long, elongate at apex to bear narrow fertile portion. Sori in two distinct rows, each row at medial portion between midrib and margin; fertile portion usually at upper half of laminae, 2–5 cm long, usually up to 5 mm broad, or the sori extending downwards nearly to the base of laminae .

Distribution in Thailand

PENINSULAR: Yala.

Wider Distribution

Throughout Malesia to Polynesia and Queensland.

Ecology

On tree trunks at low altitudes in the southernmost part of Peninsular.

Proposed IUCN Conservation Assessment

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