Vascular plants include the clubmosses, horsetails, ferns, gymnosperms (including conifers) and angiosperms (flowering plants). All gymnosperms and many angiosperms are woody plants. Like gymnosperms, angiosperms are seed-producing plants. The gymnosperms and angiosperms together compose the spermatophytes or seed plants. Plants known from the formation include ferns, ginkgoes, gymnosperms, and angiosperms. The seed plants (gymnosperms and angiosperms) are endosporic and heterosporous. Ty3-"gypsy" retrotransposons are widely distributed in the plant kingdom, including both gymnosperms and angiosperms. They are commonly found in both gymnosperms and angiosperms. Instead, correlations can be made between the number of extant gymnosperms and angiosperms. It consumes a large variety of gymnosperms and angiosperms. Living embryophytes therefore include hornworts, liverworts, mosses, ferns, lycophytes, gymnosperms and flowering plants. In many plants such as bryophytes, ferns, and gymnosperms, egg cells are formed in archegonia. KNOX-like genes are also present in some algae, mosses, ferns and gymnosperms. The gymnosperms are divided into six phyla. True gymnosperms and zygopterid ferns also formed shallow rooting systems during the Famennian.