Arizona State University Department of Plant Biology
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Psilophyton dawsonii
Psilophyton dapsile   |   Psilophyton crenulatum   |   Psilophyton dawsonii
While the previous two species, Psilophyton dapsile and P. crenulatum, are known from compressed material, P. dawsonii is one species that shows internal anatomy. Here you see the axis in cross section. The central area is the mesarch protostele that characterizes this group. Protoxylem strands are a little difficult to make out, but they occur at several spots along the center of the axis. Outside the xylem is a zone where tissues are poorly preserved, which probably represents the phloem and possibly inner cortical zones. The band of tissue to the outside of this is the cortex, with a uniseriate epidermis on the surface.

Arizona State University | Department of Plant Biology
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