gametophore bud initial cell PO_GIT:334 rwalls In Physcomitrella patens, a gametophore bud initial typically is more bulbous than a protonema side branch initial, and its plane of first cell division is oblique, rather than perpendicular, to the plane of growth. A protonema sub-apical initial hat gives rise to a gametophore bud. plant_anatomy gametophore bud initial (exact) 茎葉体芽始原細胞 (Japanese, exact) PO:0030083 2011-05-17T09:10:08Z protonema sub-apical initial cell