Nephrolepis undulata (Afzel.) J.Sm.

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).

Habit

Habit

Habit

Habit

Rhizome with tubers

Rhizome with tubers

Stipes

Stipes

Upper surface of rachis and pinnae

Upper surface of rachis and pinnae

Hydathodes at margin of pinnae on upper surface

Hydathodes at margin of pinnae on upper surface

Upper surface of fertile pinnae

Upper surface of fertile pinnae

Lower surface of lamina

Lower surface of lamina

Pinnae with sori

Pinnae with sori

Sori

Sori

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