TAXONOMIC AND NOMENCLATURAL NOTES ON FERNS

1. Additions are made to Cheilanthes, the largest genus of the xeric ferns, that will aid in recognition of infrageneric groups and will be helpful in revisionary work on this large complex. The changes have particularly resulted in a better definition of some other genera, Pellaea, Notholaena, and Doryopteris. Notholaena is recognized in a restricted sense for the predominently farinose species of America. Other species usually referred to Notholaena are placed in Cheilan thes, as well as some often referred to Pellaea or to Doryopteris.