For the synonym of a genus of molluscs, see Tibia (gastropod).
For the muscular structure in tapeworms, see Rostellum (helminth).
Cutaway drawing of Orchis mascula showing the rostellum projecting forward from the column to form cups which keep the adhesive balls sticky.
The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing self-fertilisation.[1] In many orchids, such as Orchis mascula, the pollinia or pollen masses, are connected by stipes down to adhesive discs attached to the rostellum which forms cups keeping the discs or balls sticky.[2]
In the Catasetum flower an extension of the rostellum forms a narrow feeler or "antenna" projecting forward over the labellum.
In Catasetum flowers the rostellum projects forward at each side as an "antenna", and the pollen masses are connected by a bent stalk or pedicel to a sticky disc kept moist at the back of the flower. When an insect touches an "antenna", this releases the bent pedicel which springs straight and fires the pollinium, sticky disc first, at the insect. Charles Darwin described in Fertilisation of Orchids how he "touched the antennæ of C. callosum whilst holding the flower at about a yard's distance from the window, and the pollinium hit the pane of glass, and adhered to the smooth vertical surface by its adhesive disc."[3]
^Petra Ballings (2006). "About Orchids". Vumba nature. Archived from the original on 2009-04-22. Retrieved 2009-08-12.
^Darwin 1862, pp. 9–19
^Darwin 1862, pp. 211–214, [http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F800&pageseq=237 222–224
The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing...
Ogcocephalus rostellum, the palefin batfish, is a species of anglerfish in the batfish family Ogcocephalidae. It is found in the western Atlantic Ocean...
suckers that surround the rostellum. These are the organs of adhesive attachment to the intestinal wall of the host. The rostellum is armed with two rows...
presence of a crown (rostellum) at the tip of the scolex, and the rostellum is made up of mattock- or hammer-shaped hooks. The rostellum is surrounded by...
that it will stick to the stigma of the second flower, just below the rostellum, pollinating it. In horticulture, artificial orchid pollination is achieved...
seldom exceeding 40 mm long and 1 mm wide. The scolex bears a retractable rostellum armed with a single circle of 20 to 30 hooks. The scolex also has four...
in an Egyptian. It is characterized by unarmed scolex (i.e., hooks and rostellum are absent), presence of two sets of reproductive systems in each proglottid...
scolex has four suckers, but they have no hooks. Lack of hooks and a rostellum is an identifying feature from other Taenia species. The rest of the body...
which are dioecious Dioecious Attachment organs Sucker or bothridia, and rostellum with hooks Oral sucker and ventral sucker or acetabulum Lips, teeth, filariform...
has four suckers on its scolex ("head"), and E. granulosus also has a rostellum with hooks. Several strains of E. granulosus have been identified, and...
opening. A small splinter of wood or a grass stem is used to lift the rostellum or move the flap upward, so the overhanging anther can be pressed against...
pasqualei has a scolex with four suckers and a retractable cylindric rostellum with thorn-like hooks. Structurally, the adult parasite form is similar...
paired with 16 to 20 radial branches each. The scolex has a retractable rostellum with four rows of hooks, along with the four suckers that all cyclophyllid...
the gutter-shaped rostellum, an organ that is filled with viscid fluid. When an insect touches the sensitive tip of the rostellum, the viscid fluid is...
Oxymonas is distinguishable by the rostellum, which can be thought of as an elongated proboscis. The rostellum projects anteriorly from the organism...
(usually close to the ground) in some plants. rostellate possessing a beak (rostellum). Synonym of rostrate. rostrate with a beak. rotate circular and flattened;...
size is small, scolex is disproportionately large and uniquely shaped, rostellum is wide, and it employs beetles as intermediate host to complete its life...
simple thumb gesture. Using the stick or grass blade, field hands lift the rostellum, the flap that separates the male anther from the female stigma, and then...
containing eggs). The scolex of the adult worm contains four suckers and a rostellum that has about 25–50 hooks. The major morphological difference among different...
Global Information
