  Congestion limits the efficiency of transport networks ranging from highways
to the internet. Fungal hyphal networks are studied as an examples of optimal
biological transport networks, but the scheduling and direction of traffic to
avoid congestion has not been examined. We show here that the Neurospora crassa
fungal network exhibits anticongestion: more densely packed nuclei flow faster
along hyphal highways, and transported nuclei self-organize into fast flowing
solitons. Concentrated transport by solitons may allow cells to cycle between
growing and acting as transport conduits.
