The trouble comes if you try to sort out where one fungus begins
and the next starts; the notion of a skin-bound singular "being"
that is sentient becomes a bit fuzzy. The ganglionic system
resembles a ladder with bulbous neural tissues at the joints.
Invertebrate organisms thus are comprised of a collection of
sub-brains, each of which controls a separate part of the animal
with fairly complete autonomy and no real centralized control.
Sensors and their ganglia tend to cluster nearer the head,
making not a true brain as we understand the term but rather a
large bundle of distinct fibers. Such a nervous system is highly
efficient for responding quickly to stimuli. Each clump of nerve
cells becomes expert at some particular function–detecting and
passing along sensory information, sweeping a leg or swing in
wide uniform arc, opening and closing the jaws in slow munching
motions during feeding, and so on... It is hard for us to
imagine the mentality of beings with advanced ganglionic
intelligence. Dr. H. Chandl