Answer:
■. The club mosses, or lycophyta.
■. The current hypothesis for the origin of microphylls is called the enation theory.
■. They are the earliest group of seedless vascular plants.
■. They dominated the landscape of the Carboniferous period.
■. Club mosses are the most primitive type of seedless vascular plants.
■. clubmosses, firmosses, and quillworts — these are the some common examples of Lycophyta.
■. Extinct lycophytes like Lepidodendron and Sigillaria grew into tall trees.
■. Lycophytes, also known as ‘ferns allies’.
■. They are a clade of vascular plants similar to ferns, but have unique leaves called microphylls.
■. They usually have pinnately compound leaves.