Genera
The lepidodendrales comprises three main genera, Lepidodendron, Lepidophloios, and Sigillaria, distinguished on the basis of the ratio of scale width to height - they are otherwise identical. In addition, many "organ taxa" have been identified to the lepidodendrales: each root (Stigmaria), leaf and cone (Lepidostrobus) was originally given a different genus and species name before it could be shown that they belonged to the same organism.
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a leaf of Lepidodendron
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A lepidodendralean stalk with microphylls attached
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Stigmaria of a Lepidodendralean. Top view.
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Stigmaria with rootlets.
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A cone of Lepidodendron (form genus:Lepidostrobus).
Read more about this topic: Lepidodendrales
Famous quotes containing the word genera:
“Genius detects through the fly, through the caterpillar, through the grub, through the egg, the constant individual; through countless individuals the fixed species; through many species the genus; through all genera the steadfast type; through all the kingdoms of organized life the eternal unity. Nature is a mutable cloud which is always and never the same.”
—Ralph Waldo Emerson (1803–1882)