string-of-sausage lichen
... that the string-of-sausage lichen is very sensitive to air pollution and has become locally extinct over much of its former range?
... that the <b id="mwIw"><a href="./Usnea_articulata" id="mwJA" rel="mw:WikiLink" title="Usnea articulata">string-of-sausage lichen</a></b> is very sensitive to air pollution and has become <a href="./Local_extinction" id="mwJQ" rel="mw:WikiLink" title="Local extinction">locally extinct</a> over much of its former range?