By Ernest M. Gifford, Adriance S. Foster
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Extra resources for Morphology and Evolution of Vascular Plants, 3rd Edition (Series of Books in Biology)
Sample text
1939. The gametophyte, embryo, and young rhizome of Psilotum triquetrum Swartz. Ann. Bot. s. 3:313-336. , and W. H. Lang 1921. Old Red Sandstone plants showing structure, from the Rhynie Chert Bed, Aberdeenshire. IV. Restorations of the vascular cryprogams and discussion of their bearing on the general morphology of the Pteridophyta and the origin of the organization of land plants. Trans. Roy. Soc. Edinb. 52:831-854. Lemoigne, Y. 1968. Observation d'archegones partes par des axes du type Rhynia gwynne-vaughanii Kidston et Lang.
A, Liriodendron (tulip tree); B, Quercus (oak); C, Acer (maple); D, Quercus. ]. Eames and L. H. MacDaniels. McGraw-Hill, New York. ] FIGURE one large hole at each end of the cell (Fig. 3-16). Several to many vessel members, joined end to end, constitute a vessel. The possession of vessels is the prevailing condition in angiosperms (Magnoliophyta), and they also occur in some other groups of vascular plants. Pits occur in the lateral walls where each vessel member is in contact with the other tracheary elements and parenchyma (Fig.
3-11, B). Structure and Development of Tissue Systems In addition to its value in the topographical description and comparison of primary tissue systems, Sachs' scheme is very helpful in the morphological interpretation of tissue development at the apices of shoots and roots. Apical meristems, as shown by numerous studies, are extraordinarily variable in their histology. ) In some plants, for example, Equisetum and the leptosporangiate ferns, a single well-defined apical cell occupies the tip of the axis and represents the ultimate point of origin of all the meristematic tissue of the apex of root and shoot (see Fig.