Identify structures found in fungi

Histopathology uses tissue samples to identify fungal structures by microscopy. If fungi are suspected, the specimens are first colored with stains that highlight the fungal wall as Gomori methenamine silver (GMS) or periodic acid-Schiff (PAS). This method, although is an important tool for the microbiologist, has also several limitations.

Explanation:

Hopes this helps you. But it is probably 1,2, and 3. Or it can be all of them.