Didymoglossum bimarginatum (Bosch) Ebihara & K.Iwats.

Family

Hymenophyllaceae

Nomenclature

Didymoglossum bimarginatum (Bosch) Ebihara & K.Iwats., Blumea 51(2): 236. 2006. – Microgonium bimarginatum Bosch, Hymenophyll. Javan.: 7. 1861; Ching, Fl. Reipubl. Popularis Sin. 2: 160, pl. 8, f. 7. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 73. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 39. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 51. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 95. 1979. – Trichomanes bimarginatum (Bosch) Bosch, Ned. Kruidk. Arch. 5: 143. 1861; Copel., Philipp. J. Sci. 51: 208, pl. 33, f. 1–4. 1933; Holttum, Rev. Fl. Malaya ed. 1, 2: 92. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 17. 1961; Tagawa & K.Iwats., Fl. Thailand 3: 614. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 75. 2000.

Description

Rhizome irregularly branching, about 0.2 mm diam., densely covered with brownish hairs 0.3–0.4 mm long. Fronds 0.5–2 cm apart, simple, lobed to one-third (or very rarely to a half) way to costae, oblong to oblong-lanceolate, round to obtuse at apex, round to cuneate at base, the margin more or less crisped, 1.5–2 (–2.5) cm long, 6–8 (–10) mm broad; stipes 2–4 mm long, densely hairy; lateral veins a few to several in pairs, usually forked (or in larger fronds trifurcate); oblique false veinlets many, long, the marginal one continuous with a single row of marginal cells outside the strand, joining the ends of oblique ones. Sori one to several on the apical part of frond, terminal on the lateral veins; involucre tubular with dilated mouth, immersed in frond , 1.5–2 mm long, less than 0.8 mm diam., the mouth to 1.8 mm diam.

Distribution in Thailand

PENINSULAR: Surat Thani, Phangnga, Nakhon Si Thammarat, Trang, Yala.

Wider Distribution

Widely distributed in SE Asia and Australia, Sri Lanka to Samoa and Queensland.

Ecology

On muddy surface of rocks usually in dense forest at various altitudes.

Proposed IUCN Conservation Assessment

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

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