From the Stitch Description: This is the basic lace stitch, upon which nearly all lace patterns are built. It is simply faggoting on the right side, backed by purl rows on the wrong side. Worked plain, it makes an openwork mesh that will pull the full the fabric on the bias, either to the right or left, depending on whether the yarn-over is made before the decrease or after it. Therefore the trellis may be worked in either of two ways.
Location of Stitch: Page 190 from A Treasury of Knitting Patterns.