ABSTRACT
Four new species of rust fungi are described (Puccinia ibrae, Uredo clavo, U. crusa, and U. tuitei) and five others are reduced to synonymy (Uredo macella, U. nigropuncta, U. panamensis, Uromyces cissampelidis, and U. rzedowskii). Among the 35 new host and geographic range extensions are the first North American records of Aecidium opuntiae, P. duthiae, P. mutisiae, P. puta, and U. occultus. Olivea petitiae, formerly known only from one Puerto Rican specimen, is now reported from 13 locations in six Caribbean nations. Uromyces sabineae, formerly known only from one Puerto Rican specimen, is now reported on four new host taxa from five locations in three Caribbean nations. Spermogonia and uredinoid aecia are described for the first time for Ravenelia pithecolobii, and the first systemic aecia are reported for P. dietelii.