<prompt> I-Xylem iyisicubu esiyinkimbinkimbi se-vascular esakhiwe ngama-tracheids aqhuba amanzi noma izakhi zomkhumbi, kanye nemicu namaseli e-parenchyma. Ama-Tracheids angamaseli amade ane-lignified secondary thickening of the cell walls, akhethekile ekuqhubeni amanzi, futhi aqala ukuvela ezitshalweni ngesikhathi sokudlulela kwawo ezweni esikhathini se-Silurian eminyakeni engaphezu kwezigidi ezingama-425 edlule bheka i-Cooksonia. Ukuba nama-xylem tracheids kuchaza izitshalo ze-vascular noma ama-Tracheophytes. Ama-Tracheids ayizinhlaka ezicijile, ezinde ze-xylemy, elula kunazo zonke enezindonga zokuqala eziqhubekayo kanye nezindonga eziqhubekayo eziqhubekayo eziqhubekayo ngesimo sezindandatho, ama-hoops, noma amanethiwekhi e-reticulate. Ama-tracheids ayinkimbinkimbi kakhulu ane-valve-like valve-like aligned valve-like valve-like valve-like valve-like val  <response>: Amathracheids 