Smith, Hayden B.; Dal Grande, Francesco; Muggia, Lucia; Keuler, Rachel; Divakar, Pradeep K.; Grewe, Felix; Schmitt, Imke; Lumbsch, H. Thorsten; Leavitt, Steven D. (2020). "Metagenomic data reveal diverse fungal and algal communities associated with the lichen symbiosis". Symbiosis. 82 (1–2): 133–147. doi:10.1007/s13199-020-00699-4. hdl:11577/3440801.
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Davydov, Evgeny A.; Masson, Didier (2022). "Umbilicaria meizospora comb. nov., a south-western European endemic species of the subgenus Papillophora". The Lichenologist. 54 (1): 1–12. doi:10.1017/s0024282921000475.
Davydov, Evgeny A.; Yakovchenko, Lidia S.; Urbanavichene, Irina; Konoreva, Liudmila; Chesnokov, Sergey; Kharpukhaeva, Tatiana; Obermayer, Walter (2020). "Umbilicaria orientalis – a new species of Umbilicaria subg. Papillophora with an East Asian distribution: morphological delimitation and molecular evidence". The Lichenologist. 52 (5): 353–364. doi:10.1017/s0024282920000389.
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Smith, Hayden B.; Dal Grande, Francesco; Muggia, Lucia; Keuler, Rachel; Divakar, Pradeep K.; Grewe, Felix; Schmitt, Imke; Lumbsch, H. Thorsten; Leavitt, Steven D. (2020). "Metagenomic data reveal diverse fungal and algal communities associated with the lichen symbiosis". Symbiosis. 82 (1–2): 133–147. doi:10.1007/s13199-020-00699-4. hdl:11577/3440801.