''Quercus percoriacea'' is a species of

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda ...

, where it is known only from northern

Sarawak Sarawak ( , ) is a States and federal territories of Malaysia, state of Malaysia. It is the largest among the 13 states, with an area almost equal to that of Peninsular Malaysia. Sarawak is located in East Malaysia in northwest Borneo, and is ...

state of

Malaysia Malaysia is a country in Southeast Asia. Featuring the Tanjung Piai, southernmost point of continental Eurasia, it is a federation, federal constitutional monarchy consisting of States and federal territories of Malaysia, 13 states and thre ...

.''Quercus percoriacea'' Soepadmo
''

Plants of the World Online Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

'', Kew Science. Accessed 31 March 2023. It is placed in ''Quercus'' subgenus ''Cerris'', section ''Cyclobalanopsis''.

Range and habitat

''Quercus percoriacea'' is endemic to the island of Borneo, where it is known from three locations in northern

state, including Usun Apau National Park. The species has an estimated

area of occupancy Area is the measure of a region's size on a surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while ''surface area'' refers to the area of an open surface or the boundary of a three-dimen ...

(AOO) of only 12 km². It grows in plateau heath forests, also known as kerangas forests, on nutrient-poor sandy soil between 1,000 and 1,300 meters elevation.

Conservation

''Quercus percoriacea'' has a sparse population across a limited range. It is threatened with

habitat loss Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...

from the widespread deforestation on Borneo.

References

percoriacea Trees of Borneo Endemic flora of Borneo Flora of the Sundaland heath forests Flora of Sarawak Plants described in 1966 Endemic flora of Malaysia Taxa named by Engkik Soepadmo {{Quercus-stub