Three new fossil records of Equisetum (Equisetaceae) from the Neogene of south-western China and northern Vietnam Author Aung, Aye Thida Author Huang, Jian Author Do, Truong Van Author Song, Ai Author Liu, Jia Author Zhou, Zhe-Kun Author Su, Tao text PhytoKeys 2020 138 3 15 http://dx.doi.org/10.3897/phytokeys.138.38674 journal article http://dx.doi.org/10.3897/phytokeys.138.38674 1314-2003-138-3 70E33E044DB551A7A3994CC1BB33ABA6 Equisetum cf. pratense Ehrhart Specimens checked. XTBGSZTF0001 (Fig. 2A-B ) Locality. Dajie Formation, Sanzhangtian Village, Zhenyuan County, central Yunnan Province, South-western China ( 24.100N , 101.216E ). Age. The middle Miocene. Repository. Paleoecology Collections, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences. Description. Only one bunch of tubers are preserved on the specimen, tubers are ovate in shape, three tubers of equal size are arranged in one row (Fig. 2A-B ). The length and width of the tubers are ~ 0.9 to 1.2 cm and 0.6 to 0.8 cm, respectively. Two to three longitudinal ridges are present on the surface of each tuber (Fig. 2A-B ). The tip of the tuber is mucronate (Fig. 2A-B ). These characters fit well within the morphology of E. cf. pratense , a fossil species reported from the early Oligocene in the Luehe coal-mine, south-central Yunnan ( Zhang et al. 2007 ; Linnemann et al. 2018 ). Figure 2. A-B Equisetum cf. pratense Ehrhart C-F Equisetum yenbaiense A.T.Aung, T.Su, T.V.Do & Z.K.Zhou, sp. nov. Specimen numbers: A-B XTBGSZTF0001 (counterparts) C XTBGVNMN4002 D  XTBGVNMN4001 E XTBGVNMN4003 F XTBGVNMN4004. n = node; r = ridge. Scale bars: 1cm.