A preliminary list of 152 threatened macrolichens in Switzerland (37% ofthe Swiss flora) is presented. 13 taxa (9% ofthe total amount of species comprised in the Red data list) are considered to be extinct, 35 (23%) strongly endangered, 25 (16%) endangered, 45 (30%) vulnerable and 34 (22%) rare. The following species: Cetraria oakesiana, C. sepincola, Lobaria amplissima, L. scrobiculata, Nephroma bellum, Pannaria conoplea, Parmelia arnoldii, P. sinuosa, P. stuppea, Peltigera venosa, Ramalina obtusata, R. roesleri, R. thrausta, Sticta fuliginosa, S. sylvatica et Usnea longissima are comprised in the Red data lists of Austria, Germany and the European Community. They are considered to be threatened in their entire distribution area in Europe. Therefore they and their habitats should be protected in priority. The possibilities of protecting them are briefly discussed.