Quartersawn lumber has the growth rings of the tree approximately perpendicular to the board’s surface. In general, anything from 60-90 degrees qualifies as “quartersawn”. Quartersawn wood features straight face grain and is considered more stable than plain sawn wood. This lumber is more expensive because of the need for larger trees and the inherently wasteful cutting method.
Certain woods exhibit incredibly beautiful face grain when quartersawn. One of the most popular is white oak, beloved for its ray flecks.
Check out this video for a quick rundown of lumber terminology – Video: A Lumbering Feeling