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ophis: winter twigs, yellow birch
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ophis: winter twigs, yellow birch
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ophis: scale insects in axil of spur twig, yellow birch
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ophis: 5th year twig with 1st year offshoots, yellow birch
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ophis: male catkins at twig tips, yellow birch
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ophis: sunny side catkins, yellow birch
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ophis: shaded side catkins, yellow birch
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ophis: sectioned catkins, yellow birch
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ophis: male catkins cut crosswise, yellow birch
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ophis: 1st, 3rd, and 6th year twigs, yellow birch