Evidence for division and polarity in apical cells of bryophytes and pteridophytes

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Abstract
Apical cells on the verge of dividing, or having recently formed a new segment, or actually dividing, are not uncommonly encountered in bryophytes and pteridophytes. This is interpreted as evidence for the “classical” concept of active apical segmentation in these plants (versus the concept of a quiescent apical cell). In certain species a polarized organization of the cytoplasm of the dividing apical cells is identifiable.