n.any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem

1. Ferns are examples of acrogens, as they grow from the tips.
   蕨類植物是頂端生長植物的例子，因為它們從頂端生長。
2. In botanical studies, acrogens are contrasted with other groups like thallophytes.
   在植物學研究中，頂端生長植物與藻類等其他群體形成對比。