Fagus chienii W.C.Cheng (1935: 70) .

Type:— CHINA. Sichuan [Szechuan]: W. Pingwu Xian [Pingwu hsien], elev. ca. 1300 m, 17 August 1931, W. C. Cheng 2903 (lectotype designated here, NAS00070338; isolectotypes A00033870, CQNM0017387, E00098603, IBSC0001170, K000832761, MICH1109337, NAS00070339, NY00248568, PE00022177, PE00022178, PE00022179, PE00022180, PE00022181, PE00022182, PE00022180, SYS00054972, US 00409518) .

Note:—In the protologue, Cheng indicated W.C. Cheng 2903 as the type, but he did not specify the herbarium where the type is deposited. In searching in various herbaria, 18 duplicates were traced and all of them are syntypes since no holotype was designated under Art. 9.6 (Turland et al. 2018). Most duplicates bear cupules and the identification annotation of W. C. Cheng and are well preserved. NAS00070338 is designated here as the lectotype for the reason Cheng used to work in NAS. In the protologue, Cheng (1935) stated the locality of the type at a place near “Yao-erpa” in West of Pingwu Xian; however, none of the duplicates with a label bearing this locality, and it is also uncertain whether “Pingwuhsien” means the present Pingwu Town. For efforts to trace this type locality has not been successful, the identity of this tree species is still uncertain (e.g. Huang et al. 1999).