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Moreover, since the expression pattern is similar in a gymnosperm and in an angiosperm this function appears to be evolutionarily conserved.
Taxonomists can now say that the ferns' closest cousins are the seed plants - angiosperms (flowering plants) and gymnosperms (such as conifers).
The known flora consists of 41 ferns and fern allies, 3 gymnosperms , 291 monocots, and 516 dicots.
Although anatomically preserved tissue is not seen in rhizoconcretions from the Hebert beds, their similar size suggests they also may be gymnospermous , probably belonging to cordaites or pteridosperms.
Of the 21 taxa recorded in the census 14 showed evidence of insect damage (13 out of 15 gymnospermous taxa).
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