This is a very robust lab appropriate for high school science students and college-aged students. It's a great hands-on lab! It includes many helpful links (articles, PDFs, spreadsheets for data collection, etc.), all of which are shared with you. Lichen are bioindicators of air quality; certain species cannot survive in heavily polluted areas. This allows scientists (and us!) to estimate the air quality of an area based on the species present. There are 3 main types of lichen: bushy, leafy, and