This may be A. augustus, or it may be the Eastern North America entity Arora mentions that possesses smaller spores (I haven't had a chance to look at Bessette, Bessette and Fischer yet). Average spore size is 7.14 x 4.41 um, which is a little on the small side for A. augustus. I have not observed this locally before (in twelve years). Note the beautiful floccose stipe and underside of the annulus. Specimen at MSC (accession number will be added when obtained).