Publisher's Synopsis
Excerpt from Botanical Gazette
In the development of a tissue, whether by free cell formation or by cell division, septa are formed, that is, walls which are common to contiguous cells; these are very thin at first, and appear under the highest magnifying power as a simple plate. As the walls increase in thickness and acquire a more or less distinctly stratified structure, as seen in transverse section, the network of primary septa stands out from the thickening layers proper to each cell. The primary septum between any two cells is now distinguished as the middle lame/la (sometimes also termed intercellular substance); it attains a considerable bulk at points where several septa meet at an angle.
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