Elaphoglossum dumrongii Tagawa & K.Iwats.

Family

Dryopteridaceae

Nomenclature

Elaphoglossum dumrongii Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 112, f. 8; 1968; Tagawa & K.Iwats., Fl. Thailand 3: 309, f. 25.7–25.9. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 150, 151, 185. 2000.

Description

Rhizome creeping, about 4 mm diam., densely covered with scales; scales ovate to ovate-oblong, membranous, usually appressed, brown, 4–6 by 1.5–2.2 mm, with irregular projections at margin. Sterile frond: stipe stramineous to pale castaneous, winged on upper part, 3–10 cm long, scales at the base dense like those on rhizome, becoming more sparse upwards and smaller not appressed; lamina linear-lanceolate, narrowing towards acute to acuminate apex, very gradually narrowing and long attenuate at base, 7–16 by 0.5–1 cm, often involute at margin; midrib raised on both surfaces, very sparsely scaly below; veins obscure on both surfaces, the apex ending inside the very narrow and usually involute cartilaginous margin; coriaceous, pale green in living plants, brown in dried specimens, naked on upper surface, minutely scaly underneath with irregular dark brown appressed scales. Fertile frond: stipe 6–11 cm long; lamina similar to sterile ones both in shape and size.

Distribution in Thailand

NORTH-EASTERN: Loei.

Wider Distribution

Endemic to Thailand.

Ecology

On moist cliffs by streams or on mossy rocks in stream-beds in dense evergreen forests at about 1100–1200 m alt.; a rheophyte .

Proposed IUCN Conservation Assessment

Data Deficient (DD). This species is only known from Phu Kradueng in Loei Province.  The overall distribution of the species there, and the health of the population, requires further research to provide a conservation assessment.

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