rostellumplant anatomy
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orchids orchid
In the majority of the orchids, a portion of one of the three stigma lobes forms the rostellum, a flap of tissue that projects down in front of the anther separating the stigma and the anther. As the visiting insect backs out of the flower, it brushes the rostellum, which is covered with sticky stigmatic liquid. The pollinia are then picked up from the anther and adhere to the body of the...
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orchids orchid
...species have no rostellum, and the pollinia simply stick to stigmatic liquid that is first smeared on the back of the insect. A further specialization occurs in more advanced orchids in which the caudicles of the pollinia are already attached to the rostellum and a portion of it comes off as a sticky pad called a viscidium. In the most advanced genera a strap of nonsticky tissue from the...
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orchids orchid
...insect. A further specialization occurs in more advanced orchids in which the caudicles of the pollinia are already attached to the rostellum and a portion of it comes off as a sticky pad called a viscidium. In the most advanced genera a strap of nonsticky tissue from the column connects the pollinia to the viscidium. This band of tissue is called the stipe and should not be confused with the...
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taxonomy and characteristics flatworm
Order Diphyllidea
Two bothridia, each sometimes bisected by a median longitudinal ridge; large rostellum (cone-shaped or cylindrical projection) armed with dorsal and ventral groups...
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