Hymenophyllum holochilum (Bosch) C.Chr.
Hymenophyllum holochilum (Bosch) C.Chr., Index Filic.: 362. 1905; Copel., Philipp. J. Sci. 64: 34, pl. 14. 1937; Holttum, Rev. Fl. Malaya ed. 1, 2: 77, f. 17. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 612. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 74. 2000. – Didymoglossum holochilum Bosch, Pl. Jungh. 1: 561. 1856. – Meringium holochilum (Bosch) Copel., Philipp. J. Sci. 67: 41. 1938; Ching, Fl. Reipubl. Popularis Sin. 2: 149. 1959; Tagawa & K.Iwats., Fl. Thailand 3: 77, f. 5.4. 1979.
Rhizome slender, bearing rather sparse pale brown hairs. Stipes hairy, wingless or very narrowly winged on upper portion with a row of cells on each side, 1–2 cm long. Laminae oblong, round to moderately acute at apex, 3–6.2 cm long, 1–2.6 cm wide, bipinnatifid to tripinnatifid; rachis slender, hairy beneath, narrowly winged throughout with usually flat and not toothed wings, or sometimes not winged in lower portion; pinnae 5–9 in alternate pairs, oblong to ovate, with 2–7 segments; segments usually simple, rarely forked or trilobed; ultimate segments oblong, round at apex, distinctly toothed but not crisped, to 1.5 mm broad. Sori solitary, on basal acroscopic lobes of pinnae; involucre with tuberous base and bivalvate upper portion, cleft to half-way, about 2 mm long, 1 mm broad; lips subdeltoid, moderately acute at apex, subentire or slightly wavy or toothed .
Distribution in Thailand
PENINSULAR: Ranong, Nakhon Si Thammarat.
On trees in tropical evergreen forest at about 900 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any immediate known threat.
Voucher specimens - Thailand
Middleton et al. 4396, Nakhon Si Thammarat, Namtok Yong National Park (E).
Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 17 January 2018.