A portion of meristem tissue (PO:0009013) that is part of a peripheral zone (PO:0000225) of a shoot apical meristem (PO:0020148) and will give rise to a phyllome primordium (PO:0025128). [source: POC:curators, POC:Laurel_Cooper]
Comment
The phyllome anlagen is only detectable by gene expression, not morphology.