FIBRO-CELLULAR TISSUE. 
77 
examples of the size of the cells and 
spiral fibre. Detached cells of Pleu- 
rothallis ruscifolia have already been 
represented by e and f, Fig. 4. 
In the leaves of another Orchis, Sac- 
colabium guttatum , there are very long 
cells, in which the spiral fibres run 
obliquely, and cross each other at right 
angles, whereby a series of diamond- 
shaped markings are produced. One 
of these cells, obtained by maceration, 
is represented in Fig. 63, as seen under 
a magnifying power of two hundred 
and fifty diameters. 
Elongated cell 
from the leaf of The testa of the seed of Cohcea 
Saccolabium gut- 
tatum with spiral sccmdens yields, by maceration, the 
fibres crossing. . , , , ^ „ , , . 
isolated fibrous cells represented in 
Fig. 62, B ; they are of much smaller size, and con- 
tain a fibre remarkable for its extreme tenuity and the 
number of its coils. 
Another form of fibro-cellular tissue occurs in the 
testa of the almond, in which the fibre is interrupted, 
and the cells approach in character to those termed 
porous cells. Similar cells exist in great abundance in 
certain seeds, whose testae project laterally, forming thin 
membranes, or wings as they are called by botanists. 
In a specimen from the Sphenogyne speciosa , repre- 
sented by Fig. 64, a delicate layer exists, composed of 
elongated cells of fibro-cellular tissue ; in another spe- 
FIG. 63. 
