Some Evidences for the Interaction of Tapetal and Sporogenous Cells in Certain Vascular Plants

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Abstract
An interaction between tapetal and sporogenous cells in some vascular plants is suggested by the phenomena observed in the sporangia, the sporogenous cells of which frequently simulate the behavior of the tapetal cells. Although some of the sporogenous cells abort, many function in a normal manner after diplosis, following incomplete mitoses. The behavior of these cells is attributed to the enzymatic action of the tapetal cells. It is also suggested that sterility in some plants, including pteridophytes and spermatophytes, may be due to the enzymatic activity of the tapetum.