Amanita xenokommosis (Agaricales, Basidiomycota), a striking new species from sand dune forest of northeastern Brazil, with a key for phenetically similar species^*

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.

Keywords:

• Agaricomycetes
• Agaricomycetidae
• Amanitaceae
• Neotropic
• taxonomy

Acknowledgements

The first author wish thanks Dr. Rodham E. Tulloss for discussion on the species and suggestion about its epithet, Dr. Hong Luo and Dr. Heather Hallen-Adams for many valuable comments. Dr. Maria Alice Neves, Larissa Trierveiller-Pereira, Juliano M. Baltazar, Bianca D.B. da Silva, Iuri G. Baseia and Greg M. Mueller are kindly acknowledged by collect the specimen, E. Ricardo Drechsler-Santos for photography.

Disclosure statement

The author declares that he has no conflicts of interest.

Additional information

Funding

Felipe Wartchow, the author, acknowledges CNPq for funding the project by support the projects ‘Programa de Pesquisa em Biodiversidade’ (PPBio Proc. 60/2009) and ‘Fungos agaricoides em áreas de Mata Atlântica e Caatinga no Estado da Paraíba’ (Edital Universal Proc. 420.448/2016-0), PhD scholarship (PROTAX/CNPq/MCT Proc. 563969/05-9) and ‘Produtividade em Pesquisa’ grant (Proc. 307922/2014-6 and Proc. 307947/2017-3).