Identification of an empty pod attached to a leaf ?

While walking around a Christmas tree farm in Oregon City on Nov 29 I saw a few leaves on the ground with these tan, hollow, speckled pods attached to them. The pods are approx one inch in diameter. We cracked one open -- very easily because they are thin -- and there is nothing inside. The pods do not penetrate through the leaf; they are attached to one side. We can't tell whether they are a product of the tree / leaf, or a parasite, or something created by some kind of fauna.

Would you happen to know what they are?

Thanks very much for your time and assistance!


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