He whatu matatini te floem, e rua ngā momo pūtau matua, ko ngā pūtau tīwiri me ngā pūtau hoa e pā ana, me ngā pūtau parenchyma, ngā pūtau phloem me ngā sclereids. Ka honoa ngā pūtau tīwiri i te pito ki te pito ki ngā kōpae pito-whakarewa i waenganui i ngā mea e mōhiotia ana ko ngā kōpae tīwiri, e āhei ana ki te kawe i te whakaahua i waenganui i ngā huānga tīwiri. Kāore he karihi me ngā ribosomes i roto i ngā huānga tīwiri, ā, ko ō rātau taumahatanga me ō rātau mahi e whakahaeretia ana e ngā pūtau tīwiri tata. Ko ngā pūtau hoa, e hono ana ki ngā pūtau tīwiri mā ngā pūtau plasma, e kawenga ana mō te utaina o ngā pūtau huka ki ngā pūtau huka.
he kiko māmā ake me te mahi ōrite