Genus Xylaria is a group of fungi that are commonly referred to as the dead man's fingers. These fungi are known for their unique shapes and sizes, resembling the fingers of a hand. There are several synonyms for the genus Xylaria such as Hypoxylon, Kretzschmaria, Nemania, Rosellinia, and Daldinia. Each of these synonyms refers to different subgroups of fungi that are closely related to the Xylaria genus. While they share similar characteristics, they differ in terms of their morphology, ecological niche, and reproductive physiology. These synonyms are often used interchangeably in the scientific community to refer to this fascinating group of fungi.