Nagelus

Nagelus is a genus of fungi belonging to the family Marasmiaceae. This genus was first described in 1902 by German mycologist Max Erdwang. Species within the Nagelus genus are typically small, delicate mushrooms characterized by their thin, often translucent caps and slender stems. They are saprobic, meaning they obtain nutrients by decomposing organic matter, commonly found on decaying wood and leaf litter in forest ecosystems.

The morphology of Nagelus species can vary, but generally, they possess a convex to flattened cap that may be slightly umbonate. The gills are typically adnexed or decurrent and can be widely spaced. The stipe is usually centrally attached, hollow, and often cartilaginous. Spores are typically smooth and elliptical. Identification often relies on microscopic features as well as macroscopic characteristics.

Nagelus species are distributed globally, with many found in temperate and tropical regions. Their ecological role as decomposers contributes to nutrient cycling in their habitats. While some species might be mistaken for other small agarics, careful examination of their features is crucial for accurate classification. Research on the genus continues to explore its phylogenetic relationships and the diversity of its species.