Methenamine silver staining
Several histological stains use methenamine silver. Those used to highlight fungal organisms are based on Gömöri's original description, with subsequent modifications by Grocott's and others. This stains fungal organisms a brown/black on a green background (depending on counterstain used).
In combination with perioidic acid, it has been described as the Jones' staining method which is used more in renal histology to highlight collagen and the glomerular basement membranes. Also known as PAMS (periodic acid methenamine silver) or JMS (Jone's methenamine silver).