caudicle


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caudicle

(ˈkɔːdɪkəl)
n
the stalk to which an orchid's pollen masses are attached
References in periodicals archive ?
Pollinarium formed by two pairs of pollinia of different size, with a Y-shaped caudicle and a hook-shaped viscidium.
Although the pollinia were traditionally considered to be attached directly to the corpuscle in the Secamonoideae, recent studies in Secamone (Civeyrel, 1995, 1996) have shown that in several cases there is a short caudicle between the pollinia and the corpuscle.
The statement that the pollinia are attached to the caudicle at their apex is not correct for the Asclepiadeae.
The Fockeeae was separated from the Marsdenieae by the lack of caudicles and the lack of a floor in the lower third of the corpuscle.
A further argument that Kunze (1993) put forward to isolate Fockea from the remaining Asclepiadaceae was the hypothesis that the "lateral adhesive pads in Fockea" (attaching the corpuscle to the guide rails) are homologous to the "caudicles of other Asclepiadaceae" and therefore are unique to Fockea (and Cibirhiza).
(2) The majority of orchid flowers attach pollinia indirectly to an adhesive plug (the viscidium) using stalk-like, connective structures produced by the anthers (caudicles) or the rostellum (stipes).
As their connective stalks (caudicles and/or stipes) usually change position as they dry out this reorients the height and angle of the pollinia so they are more likely to contact the stigma(s) as the pollinator enters a second flower, preferably on a second plant (Darwin, 1877; Faegri & van der Pijl, 1966).
The fact that the Periplocoideae, Secamone, and Fockea Endlicher all lack structures that could be precursors of the caudicles or translator arms found in the rest of the Asclepiadaceae also lays a monophyletic evolution open to some doubt.