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Grammatopteris
 Tree Fern Grammatopteris freitasii Bieland, Maranhao Province, Brazil Pedra de Fogo Formation Permian 20 cm x 19.5 cm |
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| Close-up showing small stele with pith and xylem ring surrounded by initial leaf and root traces in Grammatopteris freitasii. |
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| Stem and root traces within the mantle of Grammatopteris freitasii can be seen below. |
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| Preserved xylem tissue at the center of the rootlets in Grammatopteris freitasii can be seen in the close-up below. |
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