The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION IG.] ANATOMICAL STRUCTURE. 135 have transversely elongated tliiu places, parallel with each other, giving a ladder-like appearance, whence the name. Annular ducts (Fig. 457) are marked with cross lines or rings, which are thickened portions of the cell-wall. Spiral ducts or vessels (Fig. 453-455) have thin walls, strengthened by a spiral fibre adherent within. This is as delicate and as strong as spider- web : when uncoiled by pulling apart, it tears up and annihilates th
The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION IG.] ANATOMICAL STRUCTURE. 135 have transversely elongated tliiu places, parallel with each other, giving a ladder-like appearance, whence the name. Annular ducts (Fig. 457) are marked with cross lines or rings, which are thickened portions of the cell-wall. Spiral ducts or vessels (Fig. 453-455) have thin walls, strengthened by a spiral fibre adherent within. This is as delicate and as strong as spider- web : when uncoiled by pulling apart, it tears up and annihilates the cell- wall. The uncoded threads are seen by gently pulling apart many leaves, such as those of Amaryllis, or the stalk of a Strawberry leaflet. Laliciferotis ducts. Vessels of the Latex, or Milk-vessels are peculiar branching tubes which hold latex or uiilky juice in certain plants. It is very difficult to see them, and more so to make out their nature. They are peculiar in branching and inosculating tubes, running in among the cellular tissue; and they are very small, except when gorged and old (Fig. 460, 461).
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