Fifty-two annotated references are added to the bibliography of references on Iowa pteridophytes. The bibliography was compiled to include references which treated the taxonomic, ecologic, physiologic or phytogeographic aspects of Iowa\u27s ferns, horesetails, quillworts, clubmosses, and spikemosses. The total bibliography now contains 218 references. The status of the Iowa pteridophyte floristics is compared with that in other states in the Upper Midwest and the Great Plains. The Iowa pteridophyte flora consists of 57 species and 8 hybrids, including 47 ferns, 9 horsetails, 1 quillwort, 6 clubmosses, and 2 spikemosses
