The 4 divisions of Gymnos: 1- coniferophyte 2- Cycadophyta 3- Ginkgophyta 4- Gnetophyta Describe 1- Conifers : Pines , firs , redwoods 2- Coniferophyta : seeds , large 3- Cycadophyta : Tropical and subtropical 4- Ginkgophyta : Only living Meso Era survived in China . I hope that's help !