The wood is ring-porous, that is, the inner edge of the yearly growth ring has a row of large pores.
ring-porous woods, in which the pores appear (in a cross-section) in concentric rings, as in chestnut, ash and elm.
A wood with its large pores collected into one row or in a single band is said to be ring-porous.
ring-porous woods—Pores numerous, usually visible on cross-section without magnifier.
That would represent the ring-porous woods, and the large tubes would be called vessels, or trache.