The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION If).] ANATOMY OF STEMS. 141 2. The Guicen Bark or Middle Bark. This cousists of cellalar tissue only, and contains the same green matter {chlorophyll, 417) as the leaves. In woody stems, before the season's growth is completed, it becomes cov- ered by 3. The Corky Layer or Outer Bark, tlie cells of which contain no chlorophyll, and are of the nature of cork. Common cork is the thick corky layer of the bark of the Cork-Oak of Spain. It is this which gives to the stems or twig
The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION If).] ANATOMY OF STEMS. 141 2. The Guicen Bark or Middle Bark. This cousists of cellalar tissue only, and contains the same green matter {chlorophyll, 417) as the leaves. In woody stems, before the season's growth is completed, it becomes cov- ered by 3. The Corky Layer or Outer Bark, tlie cells of which contain no chlorophyll, and are of the nature of cork. Common cork is the thick corky layer of the bark of the Cork-Oak of Spain. It is this which gives to the stems or twigs of shrubs and trees the aspect and the color peculiar to each, — light gray in the Ash, purple in the Red Maple, red in several Dogwoods, etc. 4. The Epidermis, or skin of the plant, consisting of a layer of thirk- sidcd empty cells, which may be considered to be the outermost layer, or in most herbaceous stems the only layer, of cork-cells.
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