Lace knitting - Fir Tree stitch.
video tutorial on how to knit the Fir Tree stitch
Knitted in a multiple of 15 sts, + 1 and a 8-row repeat.
Row 1: * K1, yo, k2, ssk, p6, k2tog, k2, yo; rep from * to last st, k1.
Row 2 and all wrong side rows: Purl.
Row 3: * K2, yo, k2, ssk, p4, k2tog, k2, yo k1; rep from * to last st, k1.
Row 5: * K3, yo, k2, ssk, p2, k2tog, k2, yo, k2; rep from * to last st, k1.
Row 7: * K4, yo, k2, ssk, k2tog, k2, yo, k3; rep from * to last st, k1.

Knitting abbreviations:
K: Knit | P: Purl | Yo: Yarn over | K2tog: Knit 2 sts together | SSK: Slip slip knit.