OBSOLETE adventitious root primordium true PO:0008038 PO:0025479 plant_anatomy primordio de la ra&#237z adventicia (Spanish, exact) PO:0025480 OBSOLETE: A root primordium that will develop into an adventitious root. 不定根根原基（可視的） (Japanese, exact) This term was made obsolete because the PO does not have a distinct term for adventitious root. It is replaced by basal root primordium (PO:0025479) and shoot-borne root primordium (PO:0025480).