Abstract
Amanita is a well established genus corresponding one to the major groups of Agaricales having with a rich systematic story. Several species belonging to this genus were recently reported from Brazil. Recent studies changed drastically its infrageneric classification, recognizing the subgenera Amanita, Amanitina and Lepidella. Within the subg. Amanitina, the ectomycorrhizal species with amyloid basidiospores, appendiculate pileus and stipe base with more globose to subglobose bulb belong to sect. Roanokenses. Amanita xenokommosis belongs to this section and is described here a new species from the Brazilian Coastal Sand Dune. It is characterized by elongate to cylindrical amyloid basidiospores, brown pileus with sharp floccose appendiculate remnants and bulb covered by a large limbate/saccate universal veil. Amanita caojizong, A. manginiana, A. modesta, A. pseudomanginiana and A. pseudoporphyria are similar species, but differ in many aspects, such as basidiospores size, shape of bulb and characteristics of the universal veil.
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