41a This illustration shows some excerpts from a film, in which the lightning-fast ejection and landing of the pollinarium was recorded in its individual phases. One longitudinal half of the labeilum was removed before the exposure. (The images are counted in vertical order.)
1. Touching the antennas with a stick.
2.3. This balances out tissue tension in the area of ​​the stalk, whereby those forces become free, which cause the Pollinarimns to be catapulted out. Adhesive disk and handle are already visible.
4.5. Pollinarium shortly before detaching from the top of the column (The top of the column is not visible for photographic reasons). A change in direction of the adhesive disk connected to the handle in a hinge-like manner is clearly perceptible. The adhesive disk is probably swiveled by almost 180 ° from the moment the fling motion is triggered until the time of landing.
6. Pollinarium in flight.
7.8. When landing, the pollinarium first touches its “toes” with the entire surface of the adhesive disc. With the pictures 6 to 9 is opposite the recordings 4 and 5 to observe a stretching of the Pollinarimns, what is based on it, that the stem is swiveled in the direction of the dust bag.
9. Landing process completed. Under natural conditions, the pollinarium is attached to the insect's back and can then be transferred to the stigma when visiting a female flower. The adhesive disc usually sticks a little more firmly to the base, as it picture 9 As a result, the thread-pulling substance of the adhesive disc can be clearly seen in our photo.
41 b Pollinarium of Catasetum
1 – Adhesive disc 2 – Stalk, Stipes, 3 – Pollinium, Pollen packet,4 – Anthers- or anthers cover.
(Original size of the pollinarium with dust bag cover 20 mm, without this 10 mm.)

Continue reading

Leave a Reply

Your email address will not be published. Required fields are marked *