THE STAMEN. 107 
ally small, but sometimes attains a considerable magni- 
de, and separates the cells somewhat from each other. 
The lining of the anther is termed Endothecium by Pur- 
kinje, who has described it as composed of fibro-cellular 
tissue. 
400. Sometimes there is only one cell, as in the New Hol- 
land Heaths, Epacridee, and Marantacee. In the Butomus 
umbellatus or Flowering-rush, and in Tetratheca and Lau- 
rinez, there are four cells in the anther. See Fig. 34, the 
ther in the Laurinex. 
401. The cells of the anther open in due season to emit 
the pollen. This is called dehiscence, and the part is term- 
ed the line of dehiscence. In the generality of cases, the an- 
ther is so placed as to dehisce towards the pistil. The an- 
thers are then termed introrsae (inwards), or anticae (for- 
wards). In some plants, the line of dehiscence is turned to- 
wards the petals, when the anthers are termed extrorsae (out- 
wards), or posticae (backwards.) This form of dehiscence 
found in the Magnoliacez, and in the Crocus. i 
402. The anther dehisces or opens in four different ways. 
» It is longitudinally dehiscent, when it opens by a line or 
‘Suture, running from the base to the apex of each cell, as in 
the Lily, the Crocus. (See Fig. 33, par. 396.) This is the 
‘most common mode of dehiscence. 2. Some anthers dehisce 
by a transverse slit across the cell, as in Lemna and Alche- 
milla. 3. The anthers may de- 
hisce by pores, asin Solanum, where Fig. 34. Fig. 35. 
the upper part only of the longitu- 
dinal furrow opens—or in the Eri- 
ex, where the apex of each cell 
prolonged into a tube opening at 
top—or in Tetratheca, where 
the two cells become one at the 
apex, and dehisce by an aperture 
there common to them both. In 
Some of the genus Pyrola, the pores 
