Annual report of the United States Geological Survey to the Secretary of the Interior . CYCADEOIDEA NIGRA, FROM THE SUPPOSED JURASSIC OF COLORADO. LIBRARY OF THE UNIVERSITY ef ILLINOIS. PLATE LXTX. PLATE LXIX. Cycadeoiuea nigra Ward n. Bp 378 View of the longitudinal fracture in the direction of the minor axis of thetrunk. 528 U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT PART II PL. LXIX. CENTIMETERS CYCADEOIDEA NIGRA FROM THE SUPPOSED JURASSIC OF COLORADO LIBRARY OF THE UNIVERSITY ef ILLINOIS. PLATE LXX. 20 geol, pt 2 34 529 PLATE LXX. Page., illustrations of till: nature of the rahentacbo
Annual report of the United States Geological Survey to the Secretary of the Interior . CYCADEOIDEA NIGRA, FROM THE SUPPOSED JURASSIC OF COLORADO. LIBRARY OF THE UNIVERSITY ef ILLINOIS. PLATE LXTX. PLATE LXIX. Cycadeoiuea nigra Ward n. Bp 378 View of the longitudinal fracture in the direction of the minor axis of thetrunk. 528 U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT PART II PL. LXIX. CENTIMETERS CYCADEOIDEA NIGRA FROM THE SUPPOSED JURASSIC OF COLORADO LIBRARY OF THE UNIVERSITY ef ILLINOIS. PLATE LXX. 20 geol, pt 2 34 529 PLATE LXX. Page., illustrations of till: nature of the rahentacbous investiture of the genus 392 Fig. 1. Epidermal c-olls of ;i petiole giving origin to the rameutaceouschaff. Fig. 2. Kanientum as seen between two leaf bases within the armor. Fig. 3. Illustration of the relative great length of the chaffy hairs, whichmight be traced much farther. The oneon the left is cut obliquely, show-ing the parallel cells. Figs. 4, 5. Cross sections of the chaff, showing their Hat, sharp-edged,multicellular character. Note.—Figs. 1-3 were obtained from slides of No. (5 of the .Museum of theUniversity of Wyoming, and therefore belong to C Know/toniana. Figs. 4 and 5 arefrom Xo. , and therefore belong to C. U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT PART II PL. LXX
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