If there is only one needle attached at a site on the stem, look closely to see how it is attached. If the needle attaches to a small, peg-like structure it is Picea. The peg-like structure remains on the stem after the needle falls off creating a rough stem.
Karren Wcisel, TreeTopics.com
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Pinaceae, tree, conifer, cone, needle, evergreen, Pinus, pine, Picea, spruce, Abies, fir