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Unformatted text preview: members of the group having the trait, others not. The shapes of sporangia on various specimens of Cooksonia also vary considerably. Rhynia , shown in Figure 9, is another early vascular plant. Like Cooksonia , it lacked leaves and roots. One of the species formerly assigned to this genus, R. major , has since been reclassified as Aglaophyton major . Some paleobotanists consider A. major (Figure 10) a bryophyte, however, it does have a separate free-living sporophyte that is more prominent than the sporophyte, but appears to lack lignified conducting cells. The remaining species, R. gwynne-vaughanii is an undoubted vascular plant....
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