. Studies in fossil botany . Paleobotany. 32° STUDIES IN FOSSIL BOTANY least two layers of cells, of which the inner, more delicate layer has usually perished. The outer wall. Fig. 119.—Zygoftteris, sp. _ 1. Group of four sporangia, on a common pedicel (a) x 10. i. Two sporangia on pedicel. The uppei shows the annulus (c) in surface -view, with spores exposed aty"; the lower is in section. X 20. 2 bis. Sporangium, cut in plane passing through annulus. 3. Group of sporangia in transverse section. X 20. Lettering common to the figures : a, common peduncle ; b, sporangial wall ; <,-, annu
. Studies in fossil botany . Paleobotany. 32° STUDIES IN FOSSIL BOTANY least two layers of cells, of which the inner, more delicate layer has usually perished. The outer wall. Fig. 119.—Zygoftteris, sp. _ 1. Group of four sporangia, on a common pedicel (a) x 10. i. Two sporangia on pedicel. The uppei shows the annulus (c) in surface -view, with spores exposed aty"; the lower is in section. X 20. 2 bis. Sporangium, cut in plane passing through annulus. 3. Group of sporangia in transverse section. X 20. Lettering common to the figures : a, common peduncle ; b, sporangial wall ; <,-, annulus ; e, tapetum (?) ; f, spores ; in, pedicel of individual sporangium; n, probable place of dehiscence. All after Renault. shows a marked differentiation ; on two opposite sides it consists of small elongated cells, becoming fibrous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
Size: 1503px × 1663px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
