exosporium
/ˌɛksoʊˈspɔriəm/
noun
- The outer layer of a spore, especially in fungi or bacteria.
- Under the microscope, the exosporium of the fungal spore appeared rough and textured.
- Scientists studied the exosporium to understand how the spore survives harsh environments.
- The exosporium protects the inner parts of the spore from drying out.