Scleroglossum sulcatum (Kuhn) Alderw.
Scleroglossum sulcatum (Kuhn) Alderw., Bull. Jard. Bot. Buitenzorg, Ser. 2, 7: 39. 1912; Parris, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 191. 2010. – Vittaria sulcata Kuhn, Linnaea 36: 68. 1869. – Type: Thwaites 3807, Sri Lanka (lectotype B; isolectotypes BM, CGE, GH, K, P, PDA).
Scleroglossum pusillum auct. non (Blume) Alderw.: Tardieu & C.Chr., Fl. Indo-Chine 7(2): 524, f. 39, 4–5. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 234, f. 135. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 598. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 294. 2000.
Rhizome short, suberect, bearing a tuft of fronds at the apex, scaly; scales narrow, gradually narrowing from base towards acuminate apex, up to 4 by 0.8 mm, pale brown, entire. Stipes very short, indistinct, dark brown, glabrous. Laminae simple, linear, moderately acute at apex, 2.7–10(–19.5) cm by 0.2–3.5(–5) mm; leathery, glabrous. Soral grooves submarginal, opening towards margin, in apical to middle portion.
Distribution in Thailand
NORTHERN: Chiang Mai; SOUTH-EASTERN: Trat; PENINSULAR: Nakhon Si Thammarat, Yala.
Sri Lanka, Thailand, Vietnam, S China, Taiwan, throughout Malesia to the Pacific Islands.
On tree trunks in dense mossy forests at high altitudes, rather rare.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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