Hymenophyllum productum Kunze
Hymenophyllum productum Kunze, Bot. Zeit. 6: 305. 1848; Copel, Philipp. J. Sci. 64: 113, pl. 54. 1937; Holttum, Rev. Fl. Malaya ed. 1, 2: 83. f. 26. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 611. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 74. 2000. – Mecodium productum (Kunze) Copel., Philipp. J. Sci. 67: 20. 1938; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 38. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 71, f. 5.1. 1979.
Rhizome slender, about 0.5 mm diam. Stipes remote, glabrous but hairy at the very base, 3–5 cm long, the upper half winged with flat or slightly undulate wings. Laminae oblong to oblong-lanceolate, acute at apex, tripinnate to quadripinnatifid, herbaceous, green to deep green, glabrous throughout, (5–) 10–13 cm long, up to 5 cm wide; rachis like the upper part of stipes, slightly zigzag in upper part, winged throughout by flat wings 0.4–0.8 mm wide; pinnae up to 10 in pairs, the basal ones triangular-rhomboid, acute at apex, at the base subtruncate anteriorly and cuneate posteriorly, short stalked, up to 4.5 cm long, 2 cm wide; pinnules about 5 in pairs, with 5–10 segments; upper pinnae gradually becoming smaller; ultimate segments narrow, entire and flat at margin, obtuse to retuse at apex, 0.8–1.2 mm broad, the uppermost usually elongate up to twice as long as the normal ones. Sori extruded, lobes constricted below the base of involucre; involucre bilabiate, divided down almost to the base, just triangular, long acuminate at apex, round at base, 1.2–1.8 mm long, less than 1 mm wide; the lips toothed; receptacles clavate to somewhat columnar, included . Cell walls thin, straight.
Distribution in Thailand
PENINSULAR: Nakhon Si Thammarat.
Peninsular Malaysia, Sumatra, Borneo, Java, Philippines and north to Taiwan.
On mossy tree trunks in dense tropical evergreen forest at medium or higher altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any immediate known threat.
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