Volume 5: Plant Sciences (General)
Fungi
Thermoperiodism, Vernalization, and Photoperiodism in the Arctic
Mesozoic Paleobotany
Some Mesozoic ginkgoalean foliage of arctic regions (original specimens are 2-6 inches long): A, Czekanowskia ; B, Sphenobaiera ; C, Baiera ; D, Ginkgoites obovata ; E, leaf bundle of Czekanowskia ; F, leaf bundle of one of the Phoenicopsis ’ group ( Stephenophyllum ); G, leaf of Ginkgoites taeniata ; H, leaf of Ginkgo digitata.