78 
HISTOLOGY OF VEGETABLES. 
cimen (Fig. 65), from the seed of a Bignonia, the 
cells are longer and the fibre coarser than in the pre- 
FIG. 64 . 
Portion of testa of the seed of 
Sphenogyne speciosa. 
FIG. 65 . 
Portion of testa of the seed of a 
Bignonia. 
ceding. In the seed of Lophospermum erubescens , in 
which the thin membranous wing surrounds the entire 
circumference of the seed, the cells with their spiral 
fibres are well shown. The most remarkable specimen 
of wing, however, and one in which this tissue is 
largely developed, occurs in a plant, from the East 
Indies, Calosanthes Indica , the wing being more than 
an inch in length on each side of the seed. 
DOTTED OR POROUS TISSUE. 
The variety of tissue known as the porous , is formed 
by an unequal deposit of secondary matter on the in- 
terior of the cell wall ; the spaces pre-occupied by the 
deposit, being thinner than the other parts, produce 
