Twenty-five names in Fissidens Hedw. (including Conomitrium Mont.) and one name in Eustichia (Brid.) Brid. are newly placed in the synonymy of 11 accepted names of Fissidens. Four names, Conomitrium generalium C. Mill. [= Fissidens generalium (C. Miill.) Broth.], Diplostichum ulei C. Mill., [= Eustichia ulei (C. Mill.) Paris], Fissidens fossicola C. Miall., and Fissidens moritzianus C. Miill. are lectotypified here. A lengthy list of synonyms and other taxonomic changes on neotropical Fissidens was published recently in preparation of a monograph of the genus in the neotropics (Pursell 1994b). This report is an addendum to that list. Four lectotypes have been designated. FISSIDENS ANGUSTE-LIMBATUS Mitt., J. Linn. Soc., Bot. 12: 601. 1869, non Fissidens angusti-limbatus Broth., Hedwigia 38: 210. 1899. Type listed in Pursell (1994b). Fissidens fossicola C. Mill., Linnaea 9: 354. 1882, syn. nov. PROTOLOGUE: Argentinia Buenos-Airensis, in fossa Tigre, 28. Martio 1880: Prof. O. Schnyder. TYPE: ARGENTINA. Buenos-Airensis: in fossa Tigre, 28 Martio 1880, O. Schnyder 55 (lectotype, designated here BM). Fissidens anguste-limbatus is typically aquatic, although at times it can be found stranded well above the water line. Its aquatic habitat, and ovate to oblong-ovate, mucronate leaves will help to distinguish this species from others in section Fissidens. As is characteristic of species in section Fissidens, the limbidium is variable in thickness and