Relating to or characteristic of an appressorium, especially the structures fungi use to penetrate plant cells.
From appressorium + Latin '-alis' (relating to). This adjective form developed as mycologists needed precise terms to describe fungal structures and their functions in scientific literature.
The appressorial pad in some fungi generates incredible pressure—up to 8 atmospheres—which is like having a hydraulic press at the microscopic level to break through plant defenses.
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