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INTRODUCTION TO BOTANY. 37
Membranous texture, Contexius, Complexus memhranaceus*
A tissue of membranes united together, either cellular or
vascular.
Cellular texture, Complexus celluloszis, Tela cellulosa, Com-
pleocus utriailaris, A membranous tissue composed of cells,
which do not communicate with each other, and resemble
soap-suds. PI. 1. fig. 5. c, d.
Cells, pores, vesicles, bladders, Cellules, Utriculi. The
void spaces in the cellular texture. They vary in respect to
their sides, a, or form, b.
a. 1. Simple cells, Cellulce simplices. The sides trans-
parent.
a. 2. Dotted cells, porous cells, Cellulce pundatce. The
sides have opake dots, like glands, which are probably
pores. PI. 1. fig. 5. e, h, 1.
a. 3. Streaked cells, Cellulce Imeatce. The sides have
transverse streaks, of a glandular appearance, which are
probably slits. PI. 1. fig. 5. g. h.
b. 1. Regular cells, Cellulce re oulares, Contexius globu-
laris. Tela vesicularis. Cells exhibit a hexagonal section in
every direction ; forming the principal mass of the parenchyme.
PI. 1. fig. 5. d.
b. 2. Tubular cells, Cellulce elongatce. C. tuhdoscB, Tuhi
parvi, Utriculi Jibrosi, Complexus cellulosus lignosus, Tela
elongatn, Tela alveolaria. Long cells, closed at each end
forming the wood and ribs of plants. PI. 1. fig. 5. g.
b. 3. Necklace cells, Cellulce mojiiliformes, Cellulce precatorice,
Vasa rnoniliformia, Vasa precatoria, Vasa vermiculuria,
Vasa intercepta. Oval cells, dotted, separated from one
another by partitions, resembling the beads of a necklace;
forming the knots and joints of plants, and their roots.
They are intermediate between cells and vessels, and may
be referred to either.
Vessels, Vasa, Tuhi. Void spaces in the membranous texture,
open at their extremities : they differ in use, as they
convey the sap, a. or other fluids, b. c.
a. Sap vessels, Vasa lymphaiica, Lymphceductus, Vasa
pncumalica. These are either
a. 1 . Dotted vessels, Vasa punctata, Vasa porosa. PL I
fig. 5. h.
a. 2. Streaked vessels, Vasa liveata, Tracliece spurice,
Vasa Jissa, Vasa scalaria, Vasa annularia. These differ
from cells only by their length.
a. 3. Air vessels, Spiral vessels, Vasa spiralia, Trachece^
Vasa pneumato-chymifera, Pnemnaiophorac Tubes com-
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