Template:Codogno et al., 1989

• Codogno, M., Poelt, J. & Puntillo, D. 1989. Umbilicaria freyi spec. nova und der Formenkreis von Umbilicaria hirsuta in Europa (Lichenes, Umbilicariaceae). Plant Systematics and Evolution 165(1–2): 55–69. DOI: 10.1007/BF00936035 . ResearchGate .  
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  • RLL List # 139 / Rec.# 3389 – Recent Literature on Lichens