The Dichotomous Key...
Are the cells oval and is the cell diameter 0.8 x 1.0 - 1.5 micron
( 1 )
or are the cells rods and is the cell diameter 0.8 x 2 - 4 micron
( 2 )
...?
Both the average diameter and its range in micron should be
measured; it is important to note whether the diameter is greater
than 1 micron or less than 1 micron.
