Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/101

view B, and side view C, in fig. 13). Whilst the flower is still in bud, the pollen-grains which rest against the upper sharp edge of the stigma (but not those in the upper or lower parts of the mass) emit a multitude of

Fig. 13.

Cephalanthera grandiflora.

a. anther; in the front view, B, the two cells with the included pollen are seen.

o. one of the two lateral rudimentary anthers, or auricles.

p. masses of pollen.

s. stigma.

l. distal portion of the labellum.

A. Oblique view of perfect flower, when fully expanded.

B. Front view of column, with all the petals and sepals removed.

C. Side view of column, with all the sepals and petals removed; the narrow pillars of pollen (p) between the anther and stigma can just be seen.

tubes; and these deeply penetrate the stigmatic tissue. After this period the stigma bends a little forward, and the result is that the two friable pillars of pollen are drawn a little forward and stand almost completely free