Rostellum in a sentence

The word "rostellum" in a example sentences. Learn the definition of rostellum and how to use it in a sentence.

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Definition of Rostellum

  • A small beaklike process or extension of some part; a small rostrum; as, the rostellum of the stigma of violets, or of the operculum of many mosses; the rostellum on the head of a tapeworm.

How to use rostellum in a sentence. Rostellum pronunciation.

You can hardly imagine what an interesting morning's work you have given me, as the rostellum exhibited a quite new modification of structure.
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For the chance of your liking to look at what I have found: take a recently opened flower, drag gently up the stigmatic surface almost any object (the side of a hooked needle), and you will find the cap of the hemispherical rostellum comes off with a touch, and being viscid on under-surface, clings to needle, and as pollen-masses are already attached to the back of rostellum, the needle drags out much pollen.
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By the way, Cephalanthera has single pollen-grains, but this seems to be a case of degradation, for the rostellum is utterly aborted.
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You know the membranous cup or clinandrum, in many orchids, behind the stigma and rostellum: it is formed of a membrane which unites the filament of the normal dorsal anther with the edges of the pistil.
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So in other cases, but I have not completely traced (only seen) that going to the rostellum.
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I want to know whether anything beats in modification the rostellum of Catasetum.
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In Gymnadenia tridentata, according to Asa Gray, the anther opens in the bud, and the pollen being somewhat coherent falls on the stigma and on the rostellum which latter is penetrated by the pollen-tubes.
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It is to discover whether rostellum yet retains some of its primordial function of being penetrated by pollen-tubes.
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If you could prove what I only conjectured (from state of utriculi in rostellum and in stigma of Catasetum and Acropera) that the utriculi somehow induce, or are correlated with, penetration of pollen-tubes you will make an important physiological discovery.
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Read Asa Gray in 2nd Review of my Orchis book on pollen of Gymnadenia penetrating rostellum.
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I am interested about the Gongora, which I hope hereafter to try myself, as I have just built a small hot-house. Asa Gray's observations on the rostellum of Gymnadenia are very imperfect, yet worth looking at.
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I have been much interested by what you say on the rostellum exciting pollen to protrude tubes; but are you sure that the rostellum does excite them?
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I did think it possible or probable that perfect fertilisation might have been effected through rostellum.
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I will say nothing about the rostellum, stigmatic utriculi, fertility of Acropera and Catasetum, for I am completely bewildered: it will rest with you to settle these points by your excellent observations and experiments.
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I have asked Asa Gray for seeds, to whom I have mentioned your observations on rostellum, and asked him to look closer to the case of Gymnadenia.
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I would give a good deal to know what the rostellum is, of which I have traced so many curious modifications.
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Examples of Rostellum

Example #1
In the winter of 1868-9 Walsh was, however, appointed State Entomologist of Illinois.
Example #2
It has been extremely kind of you to take so very much trouble for me.
Example #3
But to do this, the curiously projecting and fleshy summits of anther-cases must at some time be pushed back slightly.
Example #4
I wrote yesterday to thank you for the Epipactis.
Example #5
Oddly, the columns of pollen are here kept in place by very early penetration of pollen-tubes into the edge of the stigma; nevertheless, it receives more pollen by insect agency.
Example #6
It seems curious that a flower should exist which could, at most, fertilise only two other flowers, seeing how abundant pollen generally is; this fact I look at as explaining the perfection of the contrivance by which the pollen, so important from its fewness, is carried from flower to flower.