AMERICAN Volume 93 FERN Number1 January-March 2003 JOURNAL QUARTERLY JOURNAL OF THE AMERICAN FERN SOCIETY e Gametophyte of Diphasiastrum s Polypodium appalachianum: An Unusual Tree Canopy Epiphyte in the Great Smoky Mountains National Park Harold W. Keller, Paul G. Davison, Christopher H. Haufler and Damon B. Lesmeister Shorter Notes