Didymoglossum exiguum (Bedd.) Copel.

Family

Hymenophyllaceae

Nomenclature

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.

Description

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.

Ecology

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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