Loxogramme subecostata (Hook.) C.Chr.
Loxogramme subecostata (Hook.) C.Chr., Gard. Bull. Straits Settlem. 4: 405. 1929; Holttum, Rev. Fl. Malaya ed. 1, 2: 169, f. 79. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 76. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 56. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 579. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 279. 2000; Jaman, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 128. 2010. – Polypodium subecostatum Hook., Sp. Fil. 5: 59, t. 283A. 1863. – Type: Lobb s.n., Borneo, Sarawak (K).
Rhizome long creeping, about 1 mm diam., dark brown to nearly black, densely scaly at apex; scales linear, dark brown, up to 5 by 0.2 mm. Stipes none or very short, scaly. Laminae attenuately acuminate at apex, gradually narrowing downwards and decurrent nearly to the base, up to 20 by 0.7–1.3 mm; midrib raised on upper surface, less distinct beneath, green on upper side and paler beneath; veins invisible, forming few series of irregular areoles; subcoriaceous, more or less fleshy, edges slightly involute, green on both surfaces. Sori slightly oblique, not overlapping each other, marginal, up to 1 cm by 1.2 mm, but variable in size, born in shallow hollows or superficial .
Distribution in Thailand
PENINSULAR: Phatthalung, Trang, Satun.
Peninsular Malaysia, Sumatra and Borneo.
On muddy rocks by streams in dense evergreen forests at low altitudes up to 400 m.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
This is similar to L. chinensis in northern districts but different from it in long creeping slender rhizome, brown scales; midrib not raised beneath; and irregularly oblique submarginal son. The form and size of sori are variable to some extent, some being very short and nearly round .
Voucher specimens - Thailand
Middleton et al. 5473, Satun, Than Plew Waterfall (E).
Upper surface of frond
Lower surface of frond and sori
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