Castanopsis grandicicatricata N. H. Xia & D. H. Vuong 2014, sp. nov.

Castanopsis grandicicatricata N. H. Xia & D. H. Vuong, sp. nov. (Figs. 1, 2) Diagnosis:— The new species is similar to Castanopsis javanica, but differs mainly in its cupules 6–7 cm in diameter (vs. 2.5–5 cm), scar covering 2/3 of nut (vs. scar covering 1/4–1/3 of nut) and thickly papery leaf texture (vs. thickly leathery). Type: — VIETNAM. Nghe An: Thanh Chuong District, Thanh Chuong Protection Forest, 18º41′01″ N, 105º09′12″ E, ca. 300 m, 27 August 2011, D. H . Vuong 2011082701 (holotype VNF!; isotypes IBSC!, VNF!, VNM!). Trees, 20–35 m tall, to 50 cm in diameter; bark greyish brown, slightly shallowly fissured; young shoots sericeous with thick reddish brown thin-walled peltate trichomes; terminal buds, stipules and rachis of inflorescences grayish brown puberulent; branchlets sparsely tufted hairs, second-year branches glabrescent, with scattered small whitish lenticels. Stipules lanceolate, recurved, 3–6 × 1–3 mm, caducous. Petiole 4–8 mm, sparsely pubescent or glabrescent. Leaf blade elliptic or obovate elliptic, 8–15 × 4–6 cm, thickly papery, adaxially glabrous, abaxially with tight layers of yellowish brown thin-walled peltate trichomes, often grayish with age, without non-glandular trichomes, base cuneate to broadly cuneate, margin entire, apex cuspidate or acute; midvein adaxially raised or slightly flat; secondary veins 8–12 on each side of midvein. Male spikelets 8–12 cm long; male flowers solitary or in fascicles of 2–4, perianth 5(–6)-lobed, stamens 10(–12). Infructescences 5–10 cm long; rachis 3–5 mm thick, glabrous, sparsely lenticellate. Cupule globose, 6–7 cm in diameter, base stipitate, 5–7 mm long, inside brown appressed tomentose, wall ca. 1 mm thick, outside wall completely covered by spines; spines straight, 1–2 cm long, glabrescent, base connate in to tree-like branched bundles, 0.5–1 cm long, sparsely puberulent or glabrescent. Nut 1 per cupule, rounded and depressed on both sides, 1.4–1.7 × 2–2.7 cm, basal 2/3 part of the nut adnate to the cupule, the free part sparsely yellowish ...