Filamentous fungi are like handymen who show up at a job site for a task that requires a flathead screwdriver with a full toolbox including Phillips and specialty screwdrivers, not to mention Allen wrenches. The fungi are similarly armed with a variety of PCWDEs to first break down the components of plant cell walls, which range from simple to complex carbohydrates, and then convert them into simple sugars. When faced with a veritable buffet of carbon sources, these fungi detect which complex chains are available; this information triggers pathways to determine which enzymes should be deployed in what order to most efficiently degrade the plant biomass.