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Douglas‐fir developing seeds with seed coat removed, and representative zygotic embryos. A, Seeds of coastal Douglas‐fir collected from open‐pollinated trees and with their seed coats removed exhibit increasing hydrophobicity and size. B, Zygotic embryos excised from corresponding seeds reveal a club‐shaped embryo (July 15), elongating cotyledons (July 30) and a mature embryo with fully elongated cotyledons (Aug 16)
