Henry Imshaug, a noted North American lichenologist, died in November of 2010 at the age of 85. He spent his career at Michigan State University and was best known for his work on the genus Buellia, his enormous and important collections from the Rocky Mountains, Great Lakes region, West Indies and subantarctic islands together with his studies of those collections, and for his mentoring of a number of successful students in lichenology and bryology.