archesporium

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archesporium

the cell or group of cells from which SPORES are derived.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
In the tenuinucellate condition the megasporocyte is hypodermal rather than deep-seated; the hypodermal archespore gives rise directly to the megasporocyte without first forming parietal tissue (Figs.
The parietal tissue is derived from the archespore, which divides to form a proximal megasporocyte and a distal parietal cell (which may or may not divide further) (e.g., Davis, 1966), although in practice this cell division is rarely observed.