Vascular plants are either homosporous (or isosporous) or heterosporous. Ceratopteris is the only genus among homosporous ferns that is exclusively aquatic. Plants that are homosporous produce spores of the same size and type. All representatives must have been homosporous. Some lycophytes are homosporous while others are heterosporous. Like most ferns, members of the Cyatheaceae are homosporous. Lycopods are belong to the division Lycopodiophyta, and some are homosporous while others are heterosporous. Homosporous, with sporangia borne singly and dehiscing by a single slit.