Family

Athyriaceae

Nomenclature

Deparia subfluvialis (Hayata) M.Kato, J. Fac. Sci. Univ. Kyoto, Sect. 3, Bot. 13: 389. 1984; Tagawa & K.Iwats., Fl. Thailand 3: 621. 1988.

Deparia boryana auct. non (Willd.) M.Kato: Tagawa & K.Iwats., Fl. Thailand 3: 440. 1988. – Athyrium boryanum auct. non (Willd.) Tagawa: Boonkerd & Pollawatn, Pterid. Thailand: 189. 2000.

Description

Rhizome thick, ascending to suberect, sometimes subarborescent, up to 25 cm high, covered with intricate roots, bearing fronds in a tuft at apex, scaly; scales narrowly lanceolate, gradually narrowing towards long-tailed apex, concolorous brown, entire, up to 13 by 1.5 mm. Stipes stramineous, up to 40 cm long, hairy as well as scaly. Frond tripinnate, up to 120 cm long and wide; pinnae up to 10 pairs, the largest ones stalked, oblong-lanceolate, up to 60 by 20 cm; pinnules of larger pinnae subsessile, narrowly triangular, widest at truncate to subcordate base, long- acuminate at apex, up to 10 by 3.5 cm; ultimate segments adnate at base forming broad wings of costules, oblong, round at apex, up to 15 by 7 mm, lobed to 1/3 way, with oblique entire lobes, papyraceous; stipe, costa, costule and veins beset with coarse articulated hairs of 0.5–1 mm long; veins pinnate, all free. Sori round, costular; indusia small, fugacious .

Distribution in Thailand

NORTHERN: Chiang Rai, Tak.

Wider Distribution

S & SW China, Taiwan, Luzon. Also recorded from the Himalayas.

Ecology

Wet sandy stream-beds in deep shade at about 1000–1400 m alt.

Proposed IUCN Conservation Assessment

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