An anther wall secondary parietal cell layer (PO:0006007) formed towards the outside, after an anther wall primary parietal cell layer (An anther wall secondary parietal cell layer (PO:0006006) undergoes a periclinal division. [source: GR:Pankaj_Jaiswal, ISBN:9780003686647, PMID:2476454]
Comment
In many angiosperms, including Arabidopsis, it differentiates into the anther wall endothecium. Alternatively, it may divide periclinally to form an anther wall endothecium externally and an anther wall middle layer internally.