Phloem histology in the petioles of two genera of Pennsylvanian ferns is detailed from coal balls collected at various localities in North America. Both Ankyropteris and Anachoropteris have primary ...
Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. The cambium and its "zone" is a cell generator (reproductive tissue called ...
• A robust understanding of phloem functioning in tall trees evades us because current methods for collecting phloem sap do not lend themselves to measuring actively photosynthesizing canopy leaves. • ...
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