Most gymnosperms retain archegonia except for the most advanced genera Gnetum and Welwitschia.
Most gymnosperms retain archegonia except for the most advanced genera Gnetum and Welwitschia.
除了买麻藤属和百岁兰属以外大多数裸子植物还保留有颈卵器。
Most gymnosperms retain archegonia except for the most advanced genera Gnetum and Welwitschia.
除了买麻藤属和百岁兰属以外大多数裸子植物还保留有颈卵器。