The letter on the phylogenetic tree, one before lycophytes indicates the ancestor of all land plants.
A phylogenetic tree depicts the relationship between several creatures by tracing the course of evolution from a shared ancestor to various descendants. The relationships between individuals in a population to the entire history of life on Earth can all be represented by trees.
A lineage is shown by the vertical lines, known as branches, and nodes are where they diverge, signifying a event from a common ancestor. The term "root" actually refers to the trunk at the tree's base. All of the taxa displayed on the tree may be traced down to their most recent common ancestor at the root node.
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