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In pathology, the Grocott-Gomori's (or Gömöri) methenamine silver stain, abbreviated GMS, is a popular staining method in histology.
It is used widely as a screen for fungal organisms. Particularly useful in staining carbohydrates.
It can be used to identify the yeast-like fungus Pneumocystis jiroveci which causes a form of pneumonia called Pneumocystis Pneumonia (PCP) or Pneumocystosis.
The cell walls of these organisms are outlined by the brown to black stain.
References
Grocott's methenamine silver stain Wikipedia(Text) CC BY-SA