Two new species in Castanopsis (Fagaceae) from Vietnam and their leaf cuticular features

Abstract

Two new species, Castanopsis grandicicatricata N. H. Xia & D. H. Vuong and C. multiporcata N. H. Xia & D. H. Vuong in Vietnam, are described and illustrated. C. grandicicatricata is similar to C. javanica, but differs in the thickly papery leaf texture, cupules 6–7 cm in diameter and scar covering 2/3 of nut. C. multiporcata mostly resembles C. buruana, but differs in leaf blade 5–8 cm long, papery firmness leaf texture, abaxially glabrescent, secondary veins 6–10 pairs, petioles 0.3–0.7 cm long, cupules 2–2.5 cm diameter and concave scar. The leaf cuticular morphology of the two new species and a key to distinguish them from other species of Castanopsis are provided. The systematic placement of the two new species in Castanopsis is discussed.