The “knot-hole moss” [Anacamptodon splachnoides (Fröhl. ex Brid.) Brid.] is seldom collected by bryologists, and is considered uncommon or even rare. However, 24 collections of A. splachnoides were made from trunks of red maple (Acer rubrum L.), sugar maple (Acer saccharumMarsh.), and chestnut oak (Quercus montana Willd.), as well as from the upper pilear surface of basidiomata (“conks”) of the “mossy-cap polypore” [Oxyporus populinus Fr. = Fomes connatus (Weinm.) Gillet]. Most collections were made in Pennsylvania. Of the 24 collections, 11 were from moist knotholes, seven from moist decayed hollows or crevices, three from limb/trunk crotches, and three from mossy-cap polypore conks. Twenty-three of the 24 collections were made during the summer of 2006. Anacamptodon splachnoides was found in both closed forests and open parks, and at both high and low elevations. These results indicate that A. splachnoides is not uncommon, but overlooked because of its specific habitat.