. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) (Pteropsida) among pteridophytes (p. 9), and with them it is asso- ciated with large leaves. The contrast with Lycopsida (Lycopodiales, etc.), with small leaves and no leaf gaps, is complete. Since the coni-. FiG. 257.—Pinus Laricio: a cube from the secondary wood, reconstructed from three camera drawings and showing various features of coniferous wood; in trans- verse section at the left a few rows of small thick-walled cells of the autumn wood are shown, and at the right the larger thinner-walled cells of
. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) (Pteropsida) among pteridophytes (p. 9), and with them it is asso- ciated with large leaves. The contrast with Lycopsida (Lycopodiales, etc.), with small leaves and no leaf gaps, is complete. Since the coni-. FiG. 257.—Pinus Laricio: a cube from the secondary wood, reconstructed from three camera drawings and showing various features of coniferous wood; in trans- verse section at the left a few rows of small thick-walled cells of the autumn wood are shown, and at the right the larger thinner-walled cells of the spring wood; tr, transverse section; Ir, longitudinal radial section; It, longitudinal tangential section; m, medullary ray; b, bordered pit; s, simple pit; X400. fers are characteristically small-leaved forms, they have suggested to some a phylogenetic connection with the Lycopodiales (30, 41, 53); but the presence of leaf gaps associates them with the Filicales, and indicates that they have been deirived from large-leaved ancestors. The persistence of leaf gaps when leaves are reduced in size makes. 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 Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863; Coulter, John Merle, 1851-1928. Morphology of spermatophytes. Part I. Gymnosperms. Chicago, University of Chicago Press
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