Comparative Anatomy of the Vegetative Organs of the Phanerogams and Ferns

Comparative Anatomy of the Vegetative Organs of the Phanerogams and Ferns

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: the wider vessels, the phloem, and the endodermis. It is manifest that this structure may come about owing to the frequent junctions of the smaller collateral bundles. The above-mentioned isolated occurrence of concentric arrangement in the Cycade was found by me in some of the small bundles in the petiole of Dion; they had a round xylem, surrounded by a phloem with its elements in radial rows. Lastly, the axial bundle (described at p. 277) in the internodes of several Dicotyledonous water-plants must be placed here: namely, Hippuris, Trapa (?), Callitriche, Bulliarda, Elatine Hottonia, and Myriophyllum. It consists in general of a central xylem, completely surrounded by a phloem, both parts usually having abundant delicate parenchyma between the essential elements. In the cases of Hippuris, Trapa, Hottonia, and Elatine Alsinastrum, the persistent vessels are arranged in an interrupted ring, which surrounds a relatively thick cylinder of parenchyma (' pith'). The phloem is bounded on the outside by an endodermis. In the leaves of these plants, with the exception perhaps of Callitriche, the bundles are collateral, with normal orientation. The axial bundle of Verhuellia (p. 278) also seems to belong to this series, though Schmitz could only detect that it consists 'of a strand of prosenchymatous cells, in the middle of which runs a single spiral-vessel.' All the cases here cited, with the exception of the three elucidated by Sanio, Vochting, and Hegelmaier, require still more accurate investigation. In Bulliarda aquatica, according to Caspary's description, the middle of the stem is occupied by a thin cylindrical strand consisting chiefly of elongated cells, in which, about midway between periphery and centre, lie two indistinctly more

Product details

  • Paperback | 382 pages
  • 189 x 246 x 20mm | 680g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236640284
  • 9781236640284