Corrugated Carton Cardboard Paper Texture
It is a corrugated carton paper, so stripes can be on this fiberboard. As the name "fiberboard" implies, it has a lot of tiny fiber texture on the surface.

Some fibers are soft, but some are hard. The difference in hardness gives easily recognizable patterns to the cardboard.
 
Wood-like Fiber Paper Texture with Flecks
This coarse paper is made of fibers which make it look like a wood.

To be a woodlike paper texture, a lot of fibers can be seen. In reality, fibers are pressed to produce this kind of paper.

Occasionally, randomly oriented flecks can be found.