Premise of research. Secondary phloem produced by a bifacial vascular cambium is the distinctive feature of lignophytes, the group that comprises the seed plants and the progymnosperms. Because ...
This is a preview. Log in through your library . Abstract Specimens with well-preserved phloem tissues of the pteridosperm Callistophyton boyssetii from coal balls in the Herrin no. 6 Coal of Illinois ...
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