Xiphopterella hieronymusii (C.Chr.) Parris
Xiphopterella hieronymusii (C.Chr.) Parris, Gard. Bull. Singapore 58: 251. 2007; Boonkerd & Pollawatn, Pterid. Thailand: 294. 2000; Parris, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 203. 2010. - Polypodium hieronymusii C.Chr., Index Filic.: 533. 1906, based on Polypodium sertularioides J.Sm. ex Hieron., Hedwigia 44: 98. 1905, non Baker, 1876. - Xiphopteris hieronymusii (C.Chr.) Holttum, Rev. Fl. Malaya ed. 1, 2: 218, f. 118. 1955 ['1954']; Tagawa & K.Iwats., Fl. Thailand 3: 587. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 244. 2000. – Syntypes: Cuming 380, Peninsular Malaysia, Malacca (B, K); Griffith s.n., Peninsular Malaysia, Malacca (B); Wray 1551, Peninsular Malaysia, Pahang, G. Beremban ["G. Brumber"] (B, UC).
Rhizome short, erect, scaly at apex; scales narrow, acute to acuminate at apex, entire, about 2 mm long, membranous, light brown. Stipes very short, castaneous or darker, narrowly winged, glabrescent. Laminae linear, attenuate towards both apex and base, 3.4–15(–17.5) by 0.3–0.5 mm, deeply lobed almost to the rachis; rachis green or dark below, green above, sparsely hairy with short branched hairs; lobes subtriangular, upper edges nearly forming a right angle to the rachis, sometimes with small basal acroscopic lobules in fertile lobes, moderately acute to acute at apex, entire; thinly leathery, glabrous; veins forked or rarely simple, basiscopic, branches running to near the apex of lobes and the acroscopic ones to upper edges, forming elongate receptacles at apex. Sori round , in lobes.
Distribution in Thailand
PENINSULAR: Phangnga, Nakhon Si Thammarat, Yala.
Thailand and Peninsular Malaysia.
In moss on trees in dense primitive forests at high altitudes of Khao Luang; fairly abundant.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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