RT Journal Article T1 Rediscovery of the endangered lichen Pseudocyphellaria aurata (Lobariaceae, Ascomycota) in mainland Spain A1 Olariaga, Ibai A1 Paz Bermúdez, María Graciela A1 Calvo, Javier A1 Etayo, Javier A1 Prieto, María K1 2417 Biología Vegetal (Botánica) K1 3106.01 Conservación K1 2417.13 Ecología Vegetal AB Lichens, as well as other organisms, should be considered important biodiversity components for the establishment of priorities in conservation biology. In this study, we report six new recent localities of the highly endangered, epiphytic macrolichen Pseudocyphellaria aurata in Spain: two in Navarra and four in A Coruña. Previous Spanish reports based on literature and herbarium specimens suggest a reduction of the distribution area of P. aurata and local extinction. Pseudocyphellaria aurata is known to be extinct in six localities, where it has not been observed since the middle of the 19th century (Cádiz, Pontevedra, Málaga). Four records reported for central Spain (Zaragoza, Salamanca, Teruel) are considered unplausible. The newly discovered populations are located in well-preserved patches of atlantic deciduous forest with strong oceanic influence, whose long-term ecological stability seems evident because of the presence of ancient trees. Nevertheless, these populations are small, fragmentary, and are threatened by habitat degradation, forestry and maybe fungal pathogens. Two populations, Intzola and Beba (Navarra and A Coruña, respectively), account for 75.7% of thalli. The localities with the highest number of trees colonized by P. aurata are Santa Leocadia and Beba in A Coruña. We reassessed the conservation status of this species concluding that conservation initiatives must be implemented to avoid its extinction in mainland Spain. PB Anales del Jardín Botánico de Madrid SN 19883196 YR 2021 FD 2021-01-04 LK http://hdl.handle.net/11093/2281 UL http://hdl.handle.net/11093/2281 LA spa NO Anales del Jardín Botánico de Madrid, 77(2): e099 (2020) DS Investigo RD 13-sep-2024