J Integr Plant Biol. ›› 1991, Vol. 33 ›› Issue (4): -.

• Research Articles •    

Classification of Some Fossil Ginkgolean Leaves by Computerization

Mi Jia-rong, Yuan Qing-yang, Sun Chun-lin and Hou Hai-tao   

Abstract: Based on the description of the four species of fossil impressions of ginkgolean leaves, Ginkgo digitata (Brongn.) Heer, Ginkgo huuoni (Sternb.) Heer, Ginkgoites sibiricus (Heer) Seward and Ginkgoites taeniatus (Braun) Harris, the authors attempted to expand the qualitative study of their characteristics to quantitative study by means of computerization. The discriminant analysis was applied to the classification of these fossil. The statistic variates selected were the lobe number, length, and width, and the nerve number and the angle between two outer lobes. The diseriminant equations of the four species established by the analysis were substituted, respectively, with the variates of the type specimens as well as the Chinese or the foreign specimens of the same species. The results correspouded well with species classification. The source programme was designed in the FORTRAN 77 algorithmic language and the calculation was done on the IBM-PC computer.

Key words: Ginkgopsid, Impressions, Multiple discriminant analysis

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2022 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q