Definition
"Acrogen" is an outdated term that was historically used to describe plants that grow primarily at their tips, such as ferns and mosses. It suggested they lacked a clear vascular system and did not increase in diameter. This term is now largely obsolete in modern botany. Instead, botanists use more precise terms to describe plant growth and classification. The term is rarely used in contemporary scientific literature. It is useful for understanding the history of plant classification.