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Related article: generally found in parenchyma regions of stems, roots, leaves,
flower or fruit parts and frequently possess suberized walls. Good
illustrations of these structures may be seen in Ginger and Calamus.
INTERCELLULAR AIR SPACES
Intercellular air spaces are cavities filled with air found between
cells or groups of cells throughout the bodies of higher plants. Their
function is to permit of the rapid movement of atmospheric gases
through the entire plant body. They are formed either by the
breaking down of the middle lamella of the cell walls, where several
cells come together, and a later separation of the cells at these
places (Schizogenous inter cellular- air- spaces), or by a breaking down
and disappearance Buy Bactrim of cell walls common to groups of cells (lysigenous
intercellular-air-spaces). In terrestrial plants which live in middle
regions (mesophytes) and in desert plants (xerophytes) the intercellu-
lar-air-spaces are averagely small and more or less angular. In
plants of swamp or marsh habit they are medium-sized, while in
those which live entirely in the water (hydrophytes) they are of large
size and more or less Buy Bactrim rounded.
SECRETION RESERVOIRS
These structures are either found as globular or irregular spaces,
as in Orange and Lemon Peel and Eucalyptus leaves, containing oil
or oil and resin when they are called internal glands, or, as tube-like
spaces filled with hydrocarbon principles such as are found in Pine
leaves and stems, when they sometimes receive the name of secretion
120
PHARMACEUTICAL BOTANY
canals. Occasionally they are named according to the nature of
their contents resin or oil canal or reservoir, etc. They are gen-
erally lined with a layer of cells, usually more or less flattened, which
are characterized by possessing large nuclei. To Buy Bactrim this layer has been
assigned the name " epithelium."-
.f
PIG. 56. Resin duct (secretion reservoir) in leaf of Pinus silvestris, in cross
section at A, and in Buy Bactrim longitudinal section at B; h, cavity surrounded by the secret-
ing cells; /, /, sclerenchyma fibers surrounding and protecting the duct. (Stevens,
after Haberlandt.
Classification of Tissues According to Function. According to
their particular function, tissues may be classified as follows:
Parenchyma (fundamental tissue)
Medullary rays
Xylem cells (wood parenchyma)
Tracheae (ducts)
Phloem cells
Sieve tubes
Companion cells
f Epidermis (outer cell walls cutinized)
\ Cork (suberized tissue)
f Bast fibers Buy Bactrim
I Wood fibers
Sclerenchyma fibers
Stone cells
Collenchyma
I. CONDUCTING TISSUES
II. PROTECTIVE TISSUES
III. MECHANICAL TISSUES
CHAPTER VII
PLANT ORGANS AND ORGANISMS
An organ is a part of Buy Bactrim an organism made up of several tissues and
capable of performing some special work.
An organism is a living entity composed of different organs or
parts with functions which are separate, but mutually dependent,
and essential to the life of the individual.
The organs of flowering plants are either Vegetative or Reproduc-
tive. The vegetative organs of higher plants, are roots, stems, and
leaves. They are concerned in the absorption and elaboration of
food materials either for tissue-building or storage.
The reproductive organs of higher plants include those structures
whose function it is to continue the species, viz.: the flower, fruit and
seed.
The ripened seed is the product of reproductive processes, and the
starting point in the life of all Spermatophytes. The living part of
the seed is the embryo, which, when developed, consists of four parts,
the caulicle, or rudimentary stem, the lower end of which is the be-
ginning of the root, or radicle. At the upper extremity of the stem
are one, two, or several thickened bodies, closely resembling leaves,
known as cotyledons, and between these a small bud or plumule.
The function of the cotyledon is to build up nourishment for the
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