The leaves in this photo belong to a Cook Pine, which is a type of gymnosperm. Gymnosperms are vascular plants that grow exposed ovules and have thinner leaves, compared to the broader and flatter ones of an angiosperm. Typically, there are three types of gymnosperm leaf. There's needle-like seen on pine trees, awl-like like the ones on evergreens, and scale-like, which are like the ones in the photo. An advantage of this type of leaf is that they are able to conserve water, especially if the tree is in a drier area.
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