Family

Hymenophyllaceae

Nomenclature

Didymoglossum sublimbatum (Müll.Berol.) Ebihara & K.Iwats., Blumea 51(2): 236. 2006. – Trichomanes sublimbatum Müll.Berol., Bot. Zeit. 12: 737. 1854; C.Chr., Bot. Tidsskr. 32: 340. 1916; Copel., Philipp. J. Sci. 51: 198, pl. 28, f. 1 & 2. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 62. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 92, f. 29. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 614. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 76. 2000. – Microgonium sublimbatum (Müll.Berol.) Bosch, Hymenophyll. Javan.: 6, t. 2. 1861; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 39. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 94. 1979.

Description

Rhizome about 0.2 mm diam., densely hairy; hairs brown, simple, less than 0.4 mm long. Fronds usually 5–10 mm apart, simple, the margin obscurely lobed at most a quarter way to costae, oblong to linear-oblong, round to obtuse at apex, often more orbicular when sterile, gradually narrowing downwards to subtruncate to cuneate base, 0.9–2.5 cm long, 0.25–1 cm broad; stipes less than 3 mm long, very narrowly winged except the basal 1–2 mm, densely hairy like the rhizome; lateral veins 3–4 in pairs, simple or forked; false veinlets oblique, parallel to the lateral veins, long, ending just within the margin, usually several to fifteen lines between the adjacent lateral veins, without marginal veins. Sori 1 to 5 on the apical part of frond, terminal on the lobes; involucre tubular with dilated mouth, completely immersed in frond , 1.5–2 mm long, less than 1 mm diam., the mouth up to 2 mm diam.

Distribution in Thailand

NORTH-EASTERN: Loei; SOUTH-WESTERN: Phetchaburi; SOUTH EASTERN: Chanthaburi, Trat; PENINSULAR: Chumphon, Phangnga, Krabi, Satun, Nakhon Si Thammarat, Trang, Yala.

Wider Distribution

SE Asia generally, India (Assam) to New Guinea.

Ecology

On muddy surface of rocks usually in moist gloomy forest at high altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any immediate known threat.

Voucher specimens - Thailand

Middleton et al. 5157, Loei, Phu Luang Wildlife Sanctuary (E); Middleton et al. 3431, Phetchaburi, Kaeng Krachan National Park (E); Middleton et al. 3497, Yala, Tomo River (E).