Ray tracheid walls smooth or with minute dentations 木射线具单列射线和纺锤状射线。
2.
Tsuga dumosa richer : the regular presence of ray tracheids . axial parenchyma cells rare and distribute in the boundaries of growth rings 云南铁杉( tsugadumosaeicher ) :生长轮明显,早材至晚材略急变至渐变。