Lichens are types of fungi found in the Ascomycetes category. They grow in symbiosis with algae. They can occur anywhere on trees, rock, or even land. They have a mat like appearance and they stick on to surfaces. They do not need a daily water supply and can live in the harshest conditions. There are about two hundred species of lichen living in Antarctica. They reproduce asexually. They can have a leafy or crust-like appearance in a plethora of colors like brown, gray, yellow, and green.