Pteridospermae

例句：

1. 1. The fossils found in the Pteridospermae are significant for understanding the evolution of life on Earth.
   在蕨类植物中发现的化石对于理解地球上生命演化具有重要意义。
2. 2.The Pteridospermae is a group of plants that have lost their ability to reproduce sexually but still produce seeds.
   蕨类植物是一类已经失去了生殖能力但仍然能产生种子的植物。
3. 3.The Pteridospermae is one of the oldest groups of land plants, with fossil records dating back millions of years.
   蕨类植物是陆地植物中最古老的一群，化石记录可以追溯到数百万年前。