Didymoglossum exiguum (Bedd.) Copel.




Didymoglossum exiguum (Bedd.) Copel., Philipp. J. Sci. 67: 78. 1938; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 40. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 96, f. 5.12. 1979. – Hymenophyllum exiguum Bedd., Ferns Brit. India: t. 275. 1868. – Trichomanes exiguum (Bedd.) Baker, Syn. Fil.: 464. 1874; Bedd., Handb. Ferns Brit. India: 37. 1883; Copel., Philipp. J. Sci. 51: 205, pl. 32, f. 1–2. 1933; Holttum, Rev. Fl. Malaya ed. 1, 2: 94, f. 31. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 614. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 75. 2000.


Rhizome slender, less than 0.1 mm diam., densely covered with brownish hairs. Fronds simple, lanceolate or oblong-lanceolate, round or moderately acute at apex, cuneate at base, 5–7 (–10) mm long, less than 3 mm broad, the margin subentire, hairy with brownish stellate hairs; costae simple, continuous to the apex, not branching; false veinlets numerous, oblique, variously branching. Sori solitary at the apex of frond, half immersed; involucre tubular with dilated mouth, about 1.5 mm long, 0.7 mm diam., the mouth 0.8 mm diam.

Distribution in Thailand

SOUTH-EASTERN: Chanthaburi; PENINSULAR: Nakhon Si Thammarat, Trang.

Wider Distribution

Sri Lanka, S India and Peninsular Malaysia.


On moist mossy rocks in dense evergreen forest.

Proposed IUCN Conservation Assessment

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

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