A. Absorptive mode
over whole surface or via restricted absorbing regions , e.g.a. rhizoids in "lower" fungi
b. substrate hyphae* in "higher" fungi
c. apical tips of hyphae
*The substrate hyphae of molds nourish the aerial hyphae and reproductive hyphae
B. Extracellular digestion
Fungi secrete enzymes that depolymerize complex natural products (proteins, carbohydrates, lipids, etc.) so they can be absorbed as sources of carbon and energy.