resin gland of a young birch branch in cross section. a) epidermis cells; b) situated just under the cell layer of cork; c) bark tissue; d) the papillae of the gland, which excreted the resin

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Size: 2185px × 1418px
Photo credit: © Quagga Media / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: betula, pendula