A pollen sum of
500 AP (500 terrestrial pollen in treeless situations)
can be taken as a minimum. The following, however, may
require this total to be greatly increased.
 Uneven
distribution of pollen on the slide. This will
necessitate the counting of either a whole slide
or a entire half slide.
 A very low
number (less than 20) of added Lycopodium
spores encountered. In this case counting may
need to be continued until it is felt that the
influx calculations are statistically reliable.
 Very varied
pollen assemblages when it is obvious that many
new taxa are still appearing as counting
continues. In this case it is sensible to
continue counting until some form of equilibrium
is achieved.
