SOME ascidial stalks of Clerodendron infortunatum described earlier 1 contain a few vascular bundles which are concentric—some amphivasal and others amphicribral in structure. The amphivasal vascular ...
Research by Assistant Professor Jacob S. Suissa at the University of Tennessee, Knoxville, is revealing complexity in how ferns have evolved. Instead of the vascular structure inside fern stems ...
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