layers will allow you to take note of what
you are collecting. For example, it helps
to know the terms in order to describe
whether your lichens are branchy
(foliose) or flat (fruticose), or if the top
(upper cortex) is a different color from
the bottom (lower cortex). Once you
know the basic terms, lichen dye books
will make more sense. You can also learn
a lot by signing up for a lichen walk led by
a member of your local lichen guild.