Diplazium sorzogonense (C.Presl) C.Presl
Diplazium sorzogonense (C.Presl) C.Presl, Tent. Pterid.: 114. 1836; Bedd., Handb. Ferns Brit. India: 181. 1883;.Tardieu & C.Chr., Fl. Indo-Chine 7(2): 254, f. 28.3 & 28.4. 1940; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 456. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 196. 2000. – Asplenium sorzogonense C.Presl, Rel. Haenk. 1: 45. 1825. – Athyrium sorzogonense (C.Presl) Milde, Bot. Zeit. 1870: 354. 1870; Holttum, Rev. Fl. Malaya ed. 1, 2: 552, f. 325. 1955 [‘1954’].
Rhizome erect, about 20 cm tall; scales subtriangular, 0.8–1.3 by up to 1.2 mm, concolorous, brown, black-margined. Stipes about 40 cm long, dark stramineous, often nearly black near base, scaly throughout. Laminae pinnate, oblong-lanceolate with acute apex, 60–90 by up to 40 cm; rachis shallowly grooved above; pinnae about 20 pairs, basal one or two pairs more or less reflexed, upper ones adnate at base or decurrent to form indistinct apical portion, middle pinnae shortly stalked, patent to ascending, narrowly lanceolate, acuminate at apex, subtruncate to cordate at base, deeply lobed to 4/5 way to costa, up to 18 by 4 cm at middle; costa grooved with distinct ridges and indistinct spines minutely scaly below, hairy or glabrescent; lobes narrowly oblong, oblique, obtuse to rounded at apex, dentate at margin, 10–17 by 5–6.5 mm; papyraceous to chartaceous, deep green, paler beneath; veins pinnate, dark and distinct below, veinlets 8–10 pairs, mostly simple. Sori elongate along veinlets, somewhat marginal, often not extending to main veins with 1–2 mm of naked veinlets, but nearly to the margin of lobes; indusia crescentic, attached by posterior side, pale but brown when dry.
Distribution in Thailand
SOUTH-WESTERN: Phetchaburi; PENINSULAR: Chumphon, Ranong, Phangnga, Nakhon Si Thammarat, Yala.
Vietnam to throughout Malesia.
On rather dry mountain slopes in dense evergreen forests at medium elevations at 600–1400 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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