One has a rostellum without hooks, like the tni of the vegetable-feeders, the other has hooks like those of the carnivora. |
The rostellum is normally present, rarely absent, and is armed with two alternating rows of hooks of characteristic taenioid shape. |
Asa Gray's observations on the rostellum of Gymnadenia are very imperfect, yet worth looking at. |
The rostellum ends in a holdfast by which the cell is fixed to the gut wall of its host. |
So in other cases, but I have not completely traced that going to the rostellum. |
The third stigma is sterile and has developed into the rostellum, a sticky structure that aids in pollination by attaching the pollen to insects. |