Skeletocutis roseola (Rick ex Theiszen) Rajchenberg, 1987 (≡ Polystictus roseolus Rick ex Theiszen, 1911).
Skeletocutis roseola is a rare wood-decaying polypore. It occurs in the Atlantic Forest domain of Brazil, a very threatened domain and a hotspot for conservation.
The species is assessed as Vulnerable (VU) C2a(ii).
Skeletocutis roseola is currently known from the Southern and Southeastern Atlantic Forest domain in Brazil, in São Paulo, Santa Catarina and Rio Grande do Sul states. The species is expected to occur throughout the Southern and Southeastern Atlantic Forest of Brazil.
Skeletocutis roseola is currently known from 9 sites and 20 collections in the Atlantic Forest in Southern and Southeast Brazil, in São Paulo, Santa Catarina and Rio Grande do Sul states. The few records in over 100 years since its description suggest that the species is rare, even in intensively surveyed areas. It is expected that the species occur throughout the southern and southeastern Atlantic Forest domain of Brazil, which is now mainly composed by fragments and secondary forests, with only 28% of its original area remaining (Tabarelli et al. 2010, Rezende et al. 2018). There are an estimated 800 sites, each one with up to 10 mature individuals. Total population is estimated at no more than 8000 mature individuals. The population is undergoing continuing decline, and is expected to further decline in the future.
Population Trend: Decreasing
Skeletocutis roseola is lignicolous, growing on angiosperm trees,causing a white rot on dead wood. The species occurs throughout the southern and southeastern Atlantic Forest, in the Araucaria Moist Forests and in the coastal Atlantic Forest, as well as Montane Cloud Forests associated with these formations.
Skeletocutis roseola occurs in the Atlantic Forest of Brazil, regarded as biodiversity Hotspots for conservation priorities due to its high diversity, endemism rates and habitat loss (Myers et al. 2000). This phytogeographical domain is estimated to have only 28% of its vegetation remaining, being fragmented and composed mainly by secondary forests (Tabarelli et al. 2010, Rezende et al. 2018). According to Pinto et al. (2006), the Atlantic Forest is found in this situation due to predatory exploitation of the resources and other human actions, like territorial occupation. Over 60% of the Brazilian population lives in the Atlantic Forest, mainly in coastal areas, where the country’s largest cities are located (Rezende et al. 2018). Other threats to the Atlantic Forest include increase in fire frequency and intensity, introduction of exotic and invasive species and the connection between these factors (Brooks & Balmford 1996, Tabarelli et al. 2006, Pinto et al. 2006). Also, reduction and ‘savannization’ of Atlantic Forest is expected due to climate change in the next decades (Salazar et al. 2007).
The main actions to prevent the decline of the species are the protection of its habitat by the implementation of Protected Areas and enforcement of public policies to recover secondary forests.
More research is needed to understand and confirm the real species distribution and its ecology.
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