Abstract
Lithocarpus dahuoaiensis Ngoc & L. V. Dung, a new species from the Central highland of Vietnam, is described and illustrated. The new species is morphologically similar to Lithocarpus macphailii (M. R. Hend.) Barnett or Lithocarpus encleisocarpus (Korth.) A. Camus in having completely entire leaf margin, solitary cupule, long stalks of fruits, deeply cup-shaped or turbinate cupules, with a number of horizontal filiform lines. The species differs in its nut enclosure ca. 1/2 – 2/3 of the nut, adaxially glabrous leaf blades, secondary veins 11–12 pairs and faintly to very faintly visible hairs on the outside of the cupule. A table showing the morphological comparison of Lithocarpus dahuoaiensis with Lithocarpus macphailii and Lithocarpus encleisocarpus is also provided.
Highlights
Lithocarpus Blume is the second largest genus of the family Fagaceae, comprising 341 species (The Plant List 2013)
The center of diversity is in East to Southeast Asia, where 123 species are enumerated in China (Huang et al 1999), 58 species in Thailand (Phengklai 2008, Strijk et al 2014) and 115 species in Vietnam (Ho 2003, Ban 2005)
During our floristic inventory in Lam Dong Province in 2015, we discovered several individuals resembling species of the genus Lithocarpus
Summary
Lithocarpus Blume is the second largest genus of the family Fagaceae, comprising 341 species (The Plant List 2013). In Vietnam, the species of Fagaceae are highly diversified and can be seen in various forest types, from dry evergreen forest at lowland to montane evergreen forest at high mountains. Don) Spach., 43 species of Quercus L., one species of Trigonobalanus Forman and 115 species with two varieties of Lithocarpus have been found, indicating that Lithocarpus is the largest and most diversified genus of the family in Vietnam.
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