STONE-CELLS. 157 
The thickening layers build themselves up, over the places 
which remain thin, in such a manner that the small canals run- 
ning toward the centre or the axis of the cell often present a 
sort of star-shaped arrangement (Fig. 76). 
Fie. 75,—Various stone-cells. 
The stone-cells or sclereids (see also subsequent references 
under the section: Mechanical System of Tissue) are widely 
distributed in many barks, the testa of seeds, seed-vessels, etc. 
A series of remarkable and manifold forms of them is readily 
A. B 
Fie. 76.—Stone-cells, whose cavities, t, though radiately arranged pore-canals, p, are 
brought into connection with the outer surface, or even with adjacent cells, 7 1, 2, 3, 
thickening layers (Dippel). ; 
afforded, for example, by the star-anise. The fruit-stalk con- 
tains branched stone-cells,‘ the wall of the capsule such as are 
nearly cubical. 
' Vogl, ‘‘ Nahrungs- und Genussmittel.” Vienna, 1872, 111. 
