Abstract
Lithocarpus vuquangensis Ngoc & Hung is described from Vu Quang National Park, North Central Vietnam. The morphological comparison and phylogenetic analysis based on rbcL, matK and ITS provided evidence that the new species was not assignable to any of the previously known taxa in Vietnam and its surrounding countries. The description, photographs, preliminary conservation status and DNA barcode sequences are also provided for the new species.
Highlights
It has been known that species richness of the genus Lithocarpus Blume (Fagaceae Dumorier) is high in Vietnam where 120 species and two varieties have been reported including the recently published species, L. dahuoaiensis Ngoc & L
The morphological comparison showed that Lithocarpus vuquangensis is most similar to L. nantoensis (Hayata) Hayata distributed in Taiwan, in having entire leaf margin, mostly solitary, rarely 2 or 3 clustered cupules, cupules not completely enclosing nut and glabrous nut
Lithocarpus vuquangensis is distinct from L. hongiaoensis by its shorter petioles (1–1.5 cm long vs. 2.1–3 cm long), shorter infructescences (4–7 cm long vs. 10 cm long), longer fruiting stalks (4–6 mm long vs. almost sessile), arrangement of scales on the cupule and larger nut size (1.7–2.0 cm long, 2.1–2.4 cm in diam. vs. 0.6–0.8 cm long, 1.2–1.5 cm in diam.)
Summary
It has been known that species richness of the genus Lithocarpus Blume (Fagaceae Dumorier) is high in Vietnam where 120 species and two varieties have been reported including the recently published species, L. dahuoaiensis Ngoc & L. Two new species of mammals (Sao La - Pseudoryx nghetinhensis, Artiodactyla and the world’s largest muntjac -Muntiacus vuquangensis, Cetartiodactyla) were discovered from this national park in the 1990s (Dung et al 1993, 1994). 1,678 species of vascular plants including many endemic and rare species have been reported (Vu Quang National Park Management Board 2014, Tagane et al 2016). From 2015 to 2016, floristic expeditions were carried out in Vu Quang National Park and trees of the genus Lithocarpus were discovered that did not match any described species. Parts of the DNA barcode regions rbcL, matK (CBOL Plant Working Group 2009) and ITS (China Plant BOL Working Group 2011) were sequenced and the phylogenic relationship of L. vuquangensis and its related taxa were examined
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