Medically reviewed by Casey Gallagher, MD Repeatedly scratching an area can cause lichenification, which is thickened, rough, ...

Their damp, humid conditions mean they can be a haven for over 200 different species of bryophytes, a group of land plants, and between 100 and 200 species of lichen. They are particularly special ...

New research, however, suggests that we might be underestimating the hardiness of lichens. Researchers in Poland have revealed that some lichen species can endure a Mars-like environment while ...