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The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well. This aspect of plant morphology overlaps with the study of plant evolution and paleobotany.hese two systems are common to nearly all vascular plants, and provide a unifying theme for the study of plant morphology. By contrast, the reproductive structures are varied, and are usually specific to a particular group of plants.
Growth form. The three classes of lycophytes all have very different growth forms but they do share a number of characteristics. Lycophytes have unique leaves that separate them from all other plant groups.Their leaves, known as microphylls, have only one vein that runs down the length of the leaf.ycophytes, also known as the âfern alliesâ, are a clade of vascular plants similar to ferns but have unique leaves called microphylls. They are primitive plants and lack seeds, wood, fruit and flowers. As with the ferns, lycophytes produce spores for reproduction and are both wind-pollinated and dispersed.