Schematic representation of the distribution pattern of water filaments, (bio)vermiculations and gypsum moonmilk in Fetida Cave, along with the most representative microbial groups (in white) and the main geochemical (within squares) and mineralogical (within ovals) characteristics in each type of biofilm/deposit.

The pH values are also reported. For the water filaments, the three filament morphologies are shown, i.e. floating, sedimented, and streamer filaments.