The Amidella clade in Europe (Basidiomycota: Amanitaceae): clarification of the contentious Amanita valens (E.-J.Gilbert) Bertault and the importance of taxon-specific PCR primers for identification - Arraiano-Castilho, Ricardo; Silva, Ana Cristina; Vila-Viçosa, Carlos; Castro, Mário Rui; Morgado, Luís Neves; Oliveira, Paulo (2022)