Our taxon is distinguished from all other species in sect. Rubrotincti differ mainly in the immutable context (not changing colour when bruised) and the absence of a green reaction with ammonia on the basidiome surface (Singer 1948, 1986, Bon 1993, Vellinga 2001). Species of the morphologically similar sect. In this section, species identification depends particularly on morphological characters such as pileus colour, colour reactions of the basidiome surface when bruised or exposed to ammonia, the structure of the pileipellis, and the shape of the cheilocystidia and spores (Bon 1993, Vellinga 2010). Piloselli, a section within the Leucoagaricus/Leucocoprinus clade ( Agaricaceae) that encompasses species whose basidiomata usually stain orange-red when bruised and turn green with ammonia (Singer 1973, 1986, Vellinga 2010). The collections fit morphologically into Leucoagaricus sect. The species has been collected from an area of 50 sq. m to the south of the city it is regarded as an important green space because of its botanical biodiversity. During a survey of macrofungi conducted by the first author in a public park in Zaragoza (Parque José Antonio Labordeta), four collections of a remarkable species of Leucoagaricus were recorded on clayey soil near a Pinus halepensis plantation.
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