Candida fungus, alkalinized culture. Culture of the human fungal pathogen Candida albicans, which has alkalinized the local extracellular environment. These two cultured colonies of C. albicans were grown for 19 days on GM-bromocresol green agar, pH 4. The fungus actively raises the pH of its surrounding environment. This alkalinization converts the normally dull green medium to a strong teal blue, whilst the filamentous fringes of the colonies (white) extend away from each other.