 That section is now considered part of "Acer" section "Rubra".The holotype for "Acer taurocursum" is a part specimen numbered UCMP 9089, which at the time of description was preserved in the University of California Museum of Paleontology in Berkeley, California.The specimen was studied by paleobotanists Jack A. Wolfe of the United States Geological Survey, Denver office and Toshimasa Tanai of Hokkaido University.