Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/181

. VI. In Calanthe masuca and the hybrid C. dominii the structure is very different to what it is in most other Vandeæ. We here have two oval, pit-like stigmas on each side of the rostellum (fig. 26). The viscid disc is oval (fig. B), and has no pedicel, but eight masses of pollen are attached to it by very short and

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easily ruptured caudicles. These pollen-masses radiate from the disc like the leaves of a fan. The rostellum is broad, and its sides slope on each side towards the lateral pit-like stigmas. When the disc is removed the rostellum is seen (fig. C) to be deeply notched in the middle. The labellum is united to the column almost up to its summit, leaving a passage (n, A) to