Appressorium
![Germinating conidiospores of Hyaloperonospora parasitica. Observe the appressorium on top right.](/Images/godic/202412/21/Conidiospore-hyaloperonospora-parasitica-appressorium3733.jpg")
![Uromyces appendiculatus, germ tube and appressorium](/Images/godic/202412/21/Uromyces_appendiculatus,_germ_tube_and_appressorium,_53639673733.jpg")
An appressorium is a specialized cell typical of many fungal plant pathogens that is used to infect host plants. It is a flattened, hyphal "pressing" organ, from which a minute infection peg grows and enters the host, using turgor pressure capable of punching through even Mylar.