Hymenophyllum barbatum (Bosch) Baker
Hymenophyllum barbatum (Bosch) Baker, Syn. Fil.: 68. 1867; Copel., Philipp. J. Sci. 64: 84, pl. 43. 1937; Ching, Fl. Reipubl. Popularis Sin. 2: 157, pl. 11, f. 5–8. 1859; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 37. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 74. 1979; Tagawa & K.Iwats., Fl. Thailand 3: 611. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 72. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 27. 2007. – Leptocionium barbatum Bosch, Ned. Kruidk. Arch. 5(2): 146.1863.
Rhizome about 0.2 mm diam., covered with stiff brownish hairs when young. Stipes 1.5–2.5 cm apart, narrowly winged in the upper part, rather densely hairy, 0.8–2.5 cm long. Laminae bipinnatifid to tripinnatifid, oblong to oblong-lanceolate, moderately acute at apex, gradually narrowing or broadly cuneate to base, 3–8 cm long, at most 2.5 cm wide; rachis distinctly winged, rather densely hairy on the underside; pinnae linear-subdeltoid, acute at apex, unequally cuneate at base, the largest 1.5 cm long and 0.5 cm wide; ultimate segments linear-oblong, usually about 1.5 mm wide, distinctly toothed and flat or crisped at margin like the wings of the rachis; every axis rather distinct, hairy on the underside. Sori in the apices of short segments; involucre bilabiate almost to the base, the lips round to acute, serrate at margin; receptacles clavate, included .
Distribution in Thailand
NORTHERN: Chiang Mai, Tak, Phitsanulok; NORTH-EASTERN: Loei; SOUTH-WESTERN: Prachuap Khiri Khan; SOUTH-EASTERN: Prachin Buri, Chanthaburi.
Distribution in Laos
N India to Japan south to Taiwan and Vietnam.
On mossy tree trunks or on moist rocks in tropical evergreen forest.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is common and widespread and not under any immediate known threat.
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