The telome concept is a theoretical model proposed to explain the evolution of plant morphology, particularly in vascular plants, by Walter Zimmermann in the 1930s. It provides a framework for understanding how simple, dichotomously branching systems of early plants could give rise to complex structures observed in modern plants, including leaves, stems, and reproductive organs. According to this concept, the fundamental unit of plant structure is the telome, which is the ultimate segment or terminal branch of a dichotomously branching axis. These telomes are considered the most basic morphological units from which higher plant organs evolved through processes of modification and specialization. Telomes are generally simple, linear, and leafless branches that arise from repeated dichotomous branching. Dichotomy, which is the splitting of a growing apex into two equal branches, results in a branching pattern that forms the basic skeleton of early vascular plants. Telomes could be classified into two types: fertile telomes, which bear reproductive structures such as sporangia, and sterile telomes, which function in photosynthesis or support.