part_of part of part of vascular leaf phyllome abaxial meristem vascular leaf abaxial meristem 2012-01-28T06:33:57Z A portion of phyllome abaxial meristem (PO:0025402) tissue that is found on the abaxial side of a developing vascular leaf (PO:0009025). Contributes to the thickness of a vascular leaf (PO:0009025). There are two types of abaxial meristems. In leaves with a petiole (PO:0020038) and lamina (PO:0025060), such as Arabidopsis thaliana, an abaxial rounding meristem occurs later in development, is separated from the apical meristem (PO:0020144), and contributes to the thickness of the petiole and midrib. In unifacial leaves, the abaxial unifacial meristem occurs earlier in development, is close to but separate from the apical meristem, and contributes to the thickness and cross-sectional shape of the entire leaf. Laurel_Cooper PO:0025403 PO_GIT:414 leaf abaxial rounding meristem (narrow) leaf abaxial unifacial meristem (narrow) plant_anatomy 葉背軸側分裂組織 (Japanese, exact)