Culcita dubia, also known as the "doubtful cushion," is a term used in botany to refer to a type of moss or a type of lichen. However, there are also many synonyms for this term, depending on the region and scientific community. Some of the more common synonyms include Hypotrachyna dubia, Parmelia dubia, and Cetraria dubia. Other synonyms include Pseudocyphellaria dubia, Menegazzia dubia, and Nephroma dubium. While the name may vary, the characteristics and properties of this plant remain the same. It is typically found in forested areas, and can be used for medicinal purposes or as a food source for animals.