Origin and Development of Tissues in Stem of Selaginella wildenovii

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Abstract
The segments from the tetrahedral apical cell divide by means of anticlinal and periclinal walls. From the inner cell of the first periclinal division there arise the stelar tissues, including xylem and phloem, endodermis, and pericycle. From the outer cell arise the cortical tissues. Proto-xylem development of leaf traces precedes that of the stem, and protophloem appears slightly later. Air spaces bridged by endodermal cells form between the cortex and pericycle as a result of differential growth.

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