A portion of meristem tissue (PO:0009013) directly beneath a meristem L1 layer (PO:0009020) in a shoot apical meristem (PO:0020148) which gives rise to ground tissue (PO:0025059). [source: GR:Pankaj_Jaiswal, PMID:11283725, PMID:12221985, POC:Laurel_Cooper]
Comment
Cells in the first subepidermal layer, the L2, divide in a largely anticlinal fashion, forming a completely separate population of cells from the other cell layers. Within developing organs, the meristem L2 layer divides anticlinally and periclinally.