Currently, taxonomists have seed plants grouped into one of five phyla. Four phyla are commonly grouped together as the gymnosperms (naked seeds). These four phyla include the following extant representatives: Cycadophyta(cycads), Ginkgophyta(ginkgo), Gnetophyta(gnetophytes) and Coniferophyta(conifers). The most successful plants now are angiosperms in the phylum Anthophyta (flowering plants). Both groups have adaptations that allow members in these groups to survive in a drier environment, thus they are not restricted to damp habitats like the plants studied in the last lab. In addition, angiosperms have a unique set of characteristics that distinguishes them from gymnosperms, contributing to their success. Both gymnosperms and angiosperms exhibit alternation of generationslike the "lower plants." However, the gametophyte generation is reduced further than what you examined with the seedless vascular plants. The gametophyte generation of seed plants is dependent on the sporophyte generation to support them