Family

Oleandraceae

Nomenclature

Oleandra musifolia (Blume) C.Presl, Epimel. Bot.: 42. 1851 [‘1849’]; Bedd., Handb. Ferns Brit. India: 287. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 284. 1940; Ching, Fl. Reipubl. Popularis Sin. 2: 321. 1959; Holttum, Dansk Bot. Ark. 23: 235. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 78. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 181. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 175, 239. 2000. – Aspidium musifolium Blume, Enum. Pl. Javae: 141. 1828.

Description

Rhizome long creeping with long stiff prop roots, up to 5 mm diam., bearing a few fronds in scattered tufts, densely scaly throughout; scales appressed, lanceolate, round to moderately acute at basal edge, gradually narrowing from the broadest attached portion to tailed apex, about 7 by 1.2 mm, brown with dark attached point, paler and hairy at margin of apical portion. Fronds simple. Stipes usually short, up to 5(–8.5) cm including phyllopodia to 2 cm (very exceptionally to 6.5 cm) tall, bearing both scales and hairs. Laminae linear-lanceolate, caudately acuminate at apex, gradually narrowing towards narrow and cuneate base, up to 80 by 5 cm, the margin entire and usually plane; midrib raised below, scaly with peltate, lanceolate, pale brown scales of up to 3 mm long, herbaceous, light green; veins once or twice forked near midrib, all free, ending just inside narrow cartilaginous margin; glabrous to sparsely hairy above and beneath, glabrous to densely hairy at margin. Sori irregular row near midrib; indusia up to 2 mm in breadth, glabrous (exceptionally sparsely hairy ).

Distribution in Thailand

NORTHERN: Chiang Mai, Lamphun, Phrae, Tak, Phitsanulok; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Kanchanaburi; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Ranong, Phangnga.

Distribution in Laos

Champasak.

Wider Distribution

Sri Lanka, Indochina to Malesia.

Ecology

On tree trunks, in crevices of rocks, or on Sphagnum-bog in sunny places in light shade at 1100– 1500 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. 5062, Phitsanulok, Phu Hin Rong Kla National Park (E).

Voucher specimens - Laos

Lamxay et al. 1940, Champasak (E)