112 



STRUCTURAL BOTANY 



is still quite short. If we cut a very young anther 

 across, we find that the transverse section is nearly 

 oblong, with rounded corners (Fig. 41, A). 



B C 



Flo. 41. A, Transverse section of very young anther, v, 

 young vascular bundle ; pp, periblem cells which divide 

 to give rise to archesporium and cells of wall, w. B and 

 C, More advanced stages of the same. The cells with 

 dark outlines belong to the four archesporia. The numbers 

 1, 2, and 3 refer to the order in which the cell-walls are 

 formed, t, tape turn. (After "Warming.) Magnified about 

 200. These figures are reversed in position as compared 

 with Fig. 39. 



At each of the four corners two or three of the 

 periblem cells next below the epidermis divide by walls 

 parallel to the surface (see Fig. 41, A, p). The inner 



