caudicle

• I often speculated how the caudicle of Orchis had been formed. —  More Letters of Charles Darwin — Volume 2
• If you suppose the pollen-grains to abort in the lower half of the pollinia of Epipactis, but the parallel elastic threads to remain and cohere, you have the caudicle of Orchis, and can understand the few embedded and functionless pollen-grains. —  More Letters of Charles Darwin — Volume 2
• 1863.); namely, to split the labellum of a Cattleya, or of some allied orchis, remove caudicle from pollen-mass (so that no loose grains are about) and put it carefully into the large tongue-like rostellum, and see if pollen-tubes will penetrate, or better, see if capsule will swell. —  More Letters of Charles Darwin — Volume 2

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