花粉管

[ noun ]
(botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule
<noun.plant>

Pollen \Pol"len\, n. [L. pollen fine flour, fine dust; cf. Gr.
?]
1. Fine bran or flour. [Obs.] --Bailey.

2. (Bot.) The fecundating dustlike cells of the anthers of
flowers. See {Flower}, and Illust. of {Filament}.

{Pollen grain} (Bot.), a particle or call of pollen.

{Pollen mass}, a pollinium. --Gray.

{Pollen sac}, a compartment of an anther containing pollen,
-- usually there are four in each anther.

{Pollen tube}, a slender tube which issues from the pollen
grain on its contact with the stigma, which it penetrates,
thus conveying, it is supposed, the fecundating matter of
the grain to the ovule.

Spermatophyta \Sper`ma*toph"y*ta\, n. pl. [NL.; spermato- + Gr.
? plant.] (Bot.)
A phylum embracing the highest plants, or those that produce
seeds; the seed plants, or flowering plants. They form the
most numerous group, including over 120,000 species. In
general, the group is characterized by the marked development
of the sporophyte, with great differentiation of its parts
(root, stem, leaves, flowers, etc.); by the extreme reduction
of the gametophyte; and by the development of seeds. All the
Spermatophyta are heterosporous; fertilization of the egg
cell is either through a

{pollen tube} emitted by the microspore or (in a few
gymnosperms) by spermatozoids.

Note: The phrase ``flowering plants'' is less distinctive
than ``seed plants,'' since the conifers, grasses,
sedges, oaks, etc., do not produce flowers in the
popular sense. For this reason the terms {Anthrophyta},
{Ph[ae]nogamia}, and {Panerogamia} have been superseded
as names of the phylum by Spermatophyta.
[Webster 1913 Suppl.]