Family

Lomariopsidaceae

Nomenclature

Nephrolepis undulata (Afzel.) J.Sm., Bot. Mag. 72: 35. 1845. – Aspidium undulatum Afzel in Sw., Schrader J. Bot. 1800: 32. 1801; Hovenkamp & Miyamoto, Blumea 50: 310. 2005. – Nephrolepis tuberosa (Bory) C.Presl var. undulata (Afzel) Kuhn, Filic. Afr.: 156. 1868. – Nephrolepis cordifolia (L.) C.Presl var. undulata (Afzel) C.Chr., Index Fil. 453, 455. 1906

Nephrolepis delicatula (Decne.) Pic.-Serm., Webbia 23: 181. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 174, f. 13.2. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 174, 238. 2000. – Nephrodium delicatulum Decne. in Jacquem., Voy. Inde 4: 178, t. 179. 1844.

Nephrolepis paucifrondosa J.F.R.Almeida, J. Indian Bot. Soc. 5: 51, f. 1–5. 1926; Holttum, Dansk Bot. Ark. 23: 235. 1965.

Description

Rhizome short, erect, 1–2.5 mm diam., bearing a few fronds, many wiry slender roots, and stolons, scaly, tubers sometimes present; scales about 2.5 by 0.3 mm, pale brown, soft membranous. Stipes up to about 10 cm long, stramineous or darker, scaly with smaller rather irregular scales. Laminae linear-lanceolate, up to 45 by 6 cm, pinnate; rachis green, grooved on upper surface, minutely scaly above; lateral pinnae 50 or more pairs, 1–1.8 cm apart; middle ones larger, gradually narrowing from base to acute apex, patent or falcate near apex, dimidiate at lower base, distinctly auricled and embracing the rachis at anterior base, up to 3 by 1 cm, crenate at margin, herbaceous; veins not distinct, forked, glabrous. Sori submarginal, arranged in one row; indusia broadly reniform , up to 1.3 mm broad.

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Lamphun, Phrae, Tak; NORTH-EASTERN: Loei; EASTERN: Ubon Ratchathani; SOUTH-WESTERN: Kanchanaburi.

Wider Distribution

Tropics and subtropics worldwide.

Ecology

In muddy limestone crevices or on rocks in forest at 500–1300 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4960, Mae Hong Son, Ban Hua Ha (E); Middleton et al. 5179, Ubon Ratchathani, Phu Chong Nayoi National Park (E).