Increasing attention is being given to bryophyte and lichen vegetation on tree trunks from the standpoint of their phytosociological relations. Observations and collections for a study of the corticolous bryophytes and lichens on American beech (Fagus grandifolia Ehrh.) in a northern hardwood forest were made on a botanical foray with W. S. Benninghoff and his ecology class from UMBS, August 8, 1961. Sixteen releves (lists of all species with estimates of their cover and sociability on sample plots) were taken on beech trunks in an old age, over-mature northern hardwood-mixed conifer stand near Tahquamenon Falls (T48N, R8W, Section 1, N 1/2-SW 1/4, Luce County, Michigan). The stand was dominated by beech, hemlock (Tsuga canadensis), and yellow birch (Betula lutea). The stand is 300-350 years old (based on increment core analysis of Cedar 300+ and 307+ and Hemlock 305+ and 312 years old at DBH), with trees 20-30 meters in height having a crown closure of 80%. Cover in the shrub, herb, and ground (bryophyte and lichen) strata was 20%, 50%, and 20%, respectively.