Search for: [References = "Armstrong, R.A., Bradwell, T. \(2001\). Variation in thallus width and the growth of the lichen Rhizocarpon geographicum \(L.\) DC. Symbiosis, 30, 317\-328. Retrieved from https\:\/\/dalspace.library.dal.ca\/bitstream\/handle\/10222\/77871\/VOLUME%2030\-NUMBER%204\-2001\-PAGE%20317.pdf\?sequence=1"]