Family

Oleandraceae

Nomenclature

Oleandra wallichii (Hook.) C.Presl, Tent. Pterid.: 78. 1836; Bedd., Handb. Ferns Brit. India: 287, f. 147. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 284. 1940; Ching, Fl. Reipubl. Popularis Sin. 2: 321. 1959; Holttum, Dansk Bot. Ark. 20: 26. 1961; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 78. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 179, f. 13.4. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 176, 240. 2000. – Aspidium wallichii Hook., Exot. Fl. 1: t. 5. 1823.

Description

Rhizome long creeping, 3–4 mm diam., green or somewhat glaucous, bearing 1–3 fronds in distant tufts, densely scaly throughout; scales not appressed, oblong with long tails, round at basal edge, about 6 mm long including tails of 4 mm, 0.7 mm broad, dark brown, entire, sparsely short-hairy at apical margin. Fronds simple. Stipes dark brown to darker, 0.5–3 cm long, usually with scales and hairs, with phyllopodia less than 1 cm high. Laminae linear-lanceolate, rather suddenly narrowed, and cordate at apex, round at base, up to 35 by 4 cm, herbaceous, hairy, densely especially at margin; midrib raised below, densely scaly and hairy. Sori in one row on each side of midrib and close to it; indusia up to 1.5 mm in breadth, minutely hairy .

Distribution in Thailand

NORTHERN: Chiang Mai; NORTH-EASTERN: Loei.

Wider Distribution

Himalayas, Upper Burma, SW China, Taiwan and Vietnam.

Ecology

On mossy tree trunks or on rather dry mountain-slopes in evergreen forests at 1300– 2500 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. 4915, Chiang Mai, Doi Inthanon National Park (E); Middleton et al. 4920, Chiang Mai, Doi Inthanon National Park (E).