Hestmark, Geir (2015). "Lectotypification of Umbilicaria virginis (Umbilicariaceae)". The Lichenologist. 47 (1): 77–81. doi:10.1017/s0024282914000589.
Fahselt, Dianne; Maycock, Paul F.; Svoboda, Josef (1988). "Initial establishment of saxicolous lichens following recent glacial recession in Sverdrup Pass, Ellesmere Island, Canada". The Lichenologist. 20 (3): 253–268. doi:10.1017/s0024282988000295.