Application of IUCN red listing criteria at the regional level: a case study with Boletales across the Apennine province ecoregion and EU-habitats of Central Italy

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A Red List of the 100 Boletales (Agaricomycetidae) species recorded in Apennine Province ecoregion Subsections “Tuscan Basin, 1C1b” and “Umbria and Marche Apennine, 1C2a” (central Italy) is provided. According to the IUCN categories and criteria, 67% of the assessed species are classified as threatened, whereas 19% are Near Threatened (NT), 11% are Least Concern (LC) and 3% are Data Deficient (DD). As a consequence of the downlisting applied to the majority of the assessed taxa, no species results Critically Endangered (CR), while 44.78% of the threatened species are Endangered (EN) and 55.22% Vulnerable (VU). The distribution of Non-Threatened (NT, LC) species across 1C1b and 1C2a subsections is quite uniform, whereas the distribution of the Threatened species varies in a dissimilar way. In fact, the two subsections share 33 (4 EN, 29 VU) Threatened species, while 23 (18 EN, 5 VU) are present exclusively in 1C1b subsection and 11 (8 EN, 3 VU) only in 1C2a subsection. The present assessments will allow in future to assess these species also against the criterion A of the IUCN protocol, given that it will be possible to define a trend of the populations and to highlight a possible reduction. Supplemental data for this article is available online at https://doi.org/10.1080/11263504.2021.1918782 .