Pollen mass of Orchis mascula when first attached (A) and after depression (B), 1899. Artist: Unknown

Pollen mass of Orchis mascula when first attached (A) and after depression (B), 1899. Artist: Unknown

1-158-161 - Oxford Science Archive/Heritage Images

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Pollen mass of Orchis mascula when first attached (A) and after depression (B), 1899. From The Various Contrivances by which Orchids are Fertilized by Insects (second edition) by Charles Darwin. (London, 1899).

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