A new species and two new records of Quercus (Fagaceae) from northern Vietnam

Abstract

A new species, Quercus xuanlienensis Binh, Ngoc & Bon, is described from Xuan Lien Nature Reserve, Vietnam. The new species is morphologically similar to Q. edithiae Skan, in having 8–11 pairs of secondary veins, bowl-shaped cupules and ellipsoid to cylindrical-ellipsoid and basally convex nuts. It differs in having serrulate leaf margins only at apical 1/5–1/7, almost entire margins of bracts on cupule and much longer nuts. The species is also similar to Q. fleuryi Hickel & A. Camus in having leaves glabrous on both surfaces with only an apically serrulate margin but differs in having shorter petioles, cupules enclosing 1/5 of the nut and much longer nuts. In addition, Q. disciformis Chun & Tsiang. and Q. bella Chun & Tsiang., previously known from China, are newly recorded from Ba Vi National Park, Vietnam.

Museomics for reconstructing historical floristic exchanges: Divergence of stone oaks across Wallacea

“…Comparing with case studies reported in the original MIGseq publication, our sampling included a mix of herbarium and silica-dried samples and resulted in a roughly similar number of loci [54]. Using STACKS, an approach more adapted to population-level inquiries [56], Fagaceae-focused studies retrieved many more loci [57][58]. However, here we opted for a conservative approach in this complex group, to avoid inclusion of paralogs in our dataset.…”

Morphological and molecular evidence reveals three new species of Lithocarpus (Fagaceae) from Bidoup-Nui Ba National Park, Vietnam

“…Critically Endangered (CR). From our intensive field survey in Bidoup-Nui Ba Naitonal Park and its vicinities from 2015 to present (Tagane et al 2017& 2020, Binh et al 2018b, Lithocarpus bidoupensis was found only in a narrow area within the protected areas of Bidoup-Nui Ba National Park, and its adjascent area of Son Thai Commune at the elevation range between 1400 and 1669 m. In the area, 0.6-1.1 cm high, 1.2-1.5 cm in diam., glabrous, reddish brown to grayish brown in sicco, tomentose with soft white hairs near apex; basal scar slightly concave, 1.2-1.4 cm in diam.…”

“…Binh & Ngoc (Binh et al 2018a), Q. honbaensis H.T.Binh, Tagane & Yahara (Binh et al 2018a), Q. trungkhanhensis H.T. Binh & Ngoc (Binh et al 2018b), Q. xuanlienensis H.T.Binh, Ngoc & T.N.Bon (Binh et al 2018c), and Q. ngochoaensis Binh & Son (Binh et al 2021).…”

Variations in morphological and epidermal features of shade and sun leaves of two species: Quercus bambusifolia and Q. myrsinifolia

“…Historically, Quercus was divided into two subgenera: Quercus (scale-cup oaks) and Cyclobalanopsis (Oersted) Schneider (cycle-cup oaks). Some elevate Cyclobalanopsis to generic status (e.g., Hsu et al, 1985;Huang et al, 1999), but most taxonomists recognize it as a subgenus of Quercus (e.g., Nixon, 1993;Manos et al, 2001;Oh and Manos, 2008;Deng et al, 2013bDeng et al, , 2017Binh et al, 2018aBinh et al, , 2018b.…”

“…The genus Quercus L. (oaks, Fagaceae) is of great research interest in the field of leaf morphology (e.g., Jensen, 1977Jensen, , 1988Jensen, , 1990Knops and Jensen, 1980;Jensen et al, 1984Jensen et al, , 1993Castro-Díez et al, 1997;Kremer et al, 2002;Luo and Zhou, 2002;Borazan and Babaç, 2003;Zwieniecki et al, 2004;Gonzalez-Rodriguez and Oyama, 2005;Rodríguez and Romero, 2007;Scareli-Santos et al, 2007;Boratynski et al, 2008;Viscosi et al, 2009aViscosi et al, , 2009bViscosi et al, , 2010Viscosi et al, , 2011Song et al, 2015;Viscosi, 2015;Sun et al, 2016;Binh et al, 2018a;Gailing et al, 2018;Liu et al, 2018;Stephan et al, 2018) as well as anatomy (e.g., Llamas et al, 1995;Bussotti and Grossoni, 1997;Luo and Zhou, 2001;Batos et al, 2010;Panahi et al, 2012aPanahi et al, , 2012bPanahi et al, , 2012cDeng et al, 2013bDeng et al, , 2014Deng et al, , 2015aDeng et al, , 2015bDeng et al, , 2017Hu et al, 2014;Shahbaz et al, 2015;…”