- Iberus : revista de la Sociedad Española de Malacología
- Icones plantarum or figures, with brief descriptive characters and remarks, of new or rare plants, selected from the author's herbarium
- Icones pleurothallidinarum
- Iheringia. Série zoologia
- Illustrationes florae insularum Maris Pacifici
- Illustrations de la Flore du Congo
- Illustrations of the zoology of South Africa : consisting chiefly of figures and descriptions of the objects of natural history collected during an expedition into the interior of South Africa, in the years 1834, 1835, and 1836, fitted out by "The Cape of Good Hope Association for Exploring Central Africa" : together with a summary of African zoology, and an inquiry into the geographical ranges of species in that quarter of the globe
- Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1963 through 1989 with citations of previously published basionyms and replaced names, together with lists of the names of authors of the names and lists of names of publications used in the citations
- Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1990 through 1992 with citations of previously published basionyms and replaced names together with a bibliography of the publications in which these nova appeared
- Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1993 through 1995, inclusive, with citations of previously published basionyms and replaced names together with a bibliography of the publications in which these nova appeared
- Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1996 through 1998, inclusive, with citations of previously published basionyms and replaced names together with a bibliography of the publications in which these nova appeared
- Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1999 through 2001, inclusive, with citations of previously published basionyms and replaced names together with a bibliography of the publications in which these nova appeared
- Index to plant chromosome numbers
- Insecta; publication mensuelle de la Station entomologique de la Faculté des sciences de Rennes
- Insects of Samoa and other Samoan terrestrial arthropoda