epidermal initial cell epidermal rhizoid initial cell 2011-04-29T09:33:11Z An epidermal initial cell (PO:0000349) that gives rise to an epidermal rhizoid (PO:0030071). PO:0030068 PO_GIT:335 Part of the epidermis of a thallus or gametophore of a bryophyte or pteridophyte in the gametophytic phase or the stem of a monocot in the sporophytic phase. epidermal rhizoid initial (exact) plant_anatomy rizoide inicial epid&#233rmico (Spanish, exact) rwalls 表皮仮根始原細胞 (Japanese, exact)