The Gymnosperm Phyla

The Gymnosperm Phyla - The Gymnosperm Phyla ,...

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The Gymnosperm Phyla The four phyla of living gymnosperms are of separate clades or lineages, unlike the angiosperms,  which are a monophyletic, single lineage. “Gymnosperm” means “naked seed” and the name draws  attention to the ovules and resulting seeds that are exposed openly on the megasporophylls. Phylum Coniferophyta The conifers are woody, mostly evergreen trees, with needle-shaped or flattened leaves, which  occupy the drier and cooler sites in the world today just as their ancestors probably did in the  Permian. They are the familiar pines, firs, spruces, yews, hemlocks, and junipers of the Northern  Hemisphere forests and the  Araucaria  species of the Southern. The  Sequoias  are among the tallest  living trees (the Australians credit the  Eucalyptus , an angiosperm, as being  the  tallest), and the  bristlecone pines are among the oldest living plants. ( 
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