- Species: Dipterocarpus cinereus Slooten.
- Synonim: –
- Family: Dipterocarpaceae
- Vernacular Name: Lagan Bras
- Conservation Status: Critically Endangered (CR D ver 3.1 IUCN 2017)
- Distribution: Endemic to Mursala Island, Tapanuli Tengah DIstrict, Province of North Sumatra
Lagan Bras is recorded only grown on Mursala Island, Tapanuli Tengah, North Sumatra. In 1998, the IUCN stated that this species had been extinct, but the expedition of the Bogor Botanical Gardens – LIPI team rediscovered this species on Mursala Island in 2012, with very low population found. Because of this discovery, its status is now classified as CR.
Lagan Bras is a big tree that can exceed 100 cm in diameter and reach 50 m in height. The bark is rather smooth or thinly-peeling, with many big lenticels, resembling grains of rice, scattered along the entire surface of the stem (hence called lagan ‘bras’, which meaning as ‘grain of rice’). Lagan bras is a member of the genus Dipterocarpus, from the small leaves groups which has sized 6-8 cm long by 1.7 – 2.5 cm wide. The leaf are ovate, oblong to lanceolate, thinly coriacoues, with 7-9 pairs of secondary venation, of which forming sharp angles in the primary leaf bone. The fruit with five ‘wings’, where consists of two long wings (5 x 1.2 cm) and three short wings (5 x 5 mm).
The utilization of Lagan Bras is only known for construction timber, as for general housing and boats. By then, it was targeted for timber extraction, for which it is mainly used for boat construction. Lagan Bras is threatened to extinction due to the uncontrolled illegal logging upon Mursala Island, along with other species of timber. This also causes its natural habitat to be degraded. Lagan Bras has a very small remnant population, where the mature is estimated to not reach 500 individuals. Conservation efforts are very vital to save its population in the future.
Barstow, M. & Kusuma, Y. 2017. Dipterocarpus cinereus. The IUCN Red List of Threatened Species 2017: e.T33374A109954087. http://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T33374A109954087.en. Downloaded on 01 March 2019.