First book of botany : being an introduction to the study of the anatomy and physiology of plants, suited for beginners / by John Hutton Balfour.

  • John Hutton Balfour
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: First book of botany : being an introduction to the study of the anatomy and physiology of plants, suited for beginners / by John Hutton Balfour. Source: Wellcome Collection.

    43/138 (page 29)
    The stem is composed of parencliyma and iiTegular vascular bundles. The latter unite freely and form mesches, and they give off vessels to the fronds and to the adventitious roots. On making a transverse section of such a stem, the appearances seen are represented in fig. 39, where e is the outer portion, marked by the scars of fallen leaves, fv bundles of vessels of an irregular form, dark outside, pale in the centre, p outer layer of celh;]ar tissue, ni central cells, which are often absorbed so as to leave a cavity. In the common brake or bracken of our pasture, the lower part of the stem, when cut, exhibits bundles of vessels Avhich have the form of an oak or of a double spread-eagle. Ferns characterize mild and moist cli- mates, and they give a peculiar feature to the landscape of New Zealand. At former epochs of the earth's Fig. 38.—Stem of a tree-fern. It is acrogenoiis or increases at the top. The stem is uuiform in. diameter, marked by scars of fallen leaves c. Fig. 39.—Transverse section of the stem of a tree-fern, showing the cellular portions p m, the irregular bundles of vessels/v, and the outer portions e.