Changes

[[File:Brussels brett blend pellicle1.jpg|thumb|Pellicle from The Yeast Bay Brussels Brett Blend; courtesy of Dan Pixley]][[File:Lactobacillus pellicle.jpg|thumb|Lactobacillus pellicle; courtesy of Matt Humbard]] A '''pellicle''' is a subtype of ''biofilm'' that is formed on the surface of a beer. A ''biofilm'' is a community of microorganisms that are connected to one another through the use of material that is present in the environment, such as proteins, long chains of sugars, or live (or dead) cells. It is often formed by [[Brettanomyces]], [[Pediococcus]], or [[Lactobacillus]]. It can also be formed by [[Saccharomyces]] in rare occasions <ref name="matt">[http://phdinbeer.com/2015/01/30/beer-microbiology-what-is-a-pellicle/ Beer Microbiology – What is a pellicle? A PhD in Beer blog. Dr. Matt Humbard. 01/30/2015. Retrieved 04/26/2015.]</ref>.