siphonogamy


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siphonogamy

(ˌsaɪfənˈɒɡəmɪ)
n
(Botany) a mode of pollination in which pollen tubes develop to facilitate the passage of male cells to eggs
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In both groups pollen germinates to produce a pollen tube, responsible for delivering the male gametes (either motile, in cycads and Ginkgo, or otherwise non-motile) to the female gametophyte in the process of siphonogamy.
In some species of Tsuga extended siphonogamy exists; otherwise they may produce a pollination drop after engulfment by invagination of the apex of the nucellus (Gelbart & von Aderkas, 2002; Owens et al.
Such deposits have not been reported in conifers with extended siphonogamy.
Rescuing Robert Brown--the origins of angio-ovuly in seed cones of conifers

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