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Precambrian life fungi, bacteria and lichens algae bryophytes terrestrialization of the land the structure and organization of vascular plants early land plants with conducting tissue lycopods sphenophytes ferns progymnosperms origin and evolution of the seed habit palaeozoic seed ferns mesozoic seed ferns palaeozoic and mesozoic foliage cycadophytes ginkgophytes gymnsoperms with obscure affinities cordaites conifers flowering plants plant/animal interactions.
Schmid et al. (Mon,) studied this question.