Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 1/5, 1897

Table of handwritten notes

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      <text xml:lang="de" type="free">
        <div xml:id="echoid-div80" type="section" level="1" n="48">
          <pb o="114" file="124" n="124"/>
          <p>
            <s xml:id="echoid-s1562" xml:space="preserve">Waſſeroberfläche erreichen. </s>
            <s xml:id="echoid-s1563" xml:space="preserve">Nach erfolgter Beſtäubung ziehen
              <lb/>
            ſich dieſe langen Stiele ſpiralförmig zuſammen, ſo daß die
              <lb/>
            Frucht unter Waſſer reift.</s>
            <s xml:id="echoid-s1564" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div82" type="section" level="1" n="49">
          <head xml:id="echoid-head60" xml:space="preserve">
            <emph style="bf">X. Windblütler.</emph>
          </head>
          <p>
            <s xml:id="echoid-s1565" xml:space="preserve">Was nun die
              <emph style="sp">Windblütler</emph>
            anbetrifft, ſo beſitzen dieſe
              <lb/>
            alſo natürlich ebenſo wenig wie die Waſſerblütler eine auf-
              <lb/>
            fallende Blütendecke. </s>
            <s xml:id="echoid-s1566" xml:space="preserve">Sie ſind alſo behufs Beſtäubung auf
              <lb/>
            die bewegte Luft angewieſen. </s>
            <s xml:id="echoid-s1567" xml:space="preserve">Vor allem fällt auf, daß die
              <lb/>
            Windblütler einen ſtäubenden, in der Luft ſich leicht verbrei-
              <lb/>
            tenden Blütenſtaub beſitzen, während den inſektenblütigen
              <lb/>
            Pflanzen ein zuſammenhängender, klebriger Blütenſtaub zu-
              <lb/>
            kommt. </s>
            <s xml:id="echoid-s1568" xml:space="preserve">Sodann fällt auch die große Maſſe des Blütenſtaubes
              <lb/>
            auf, welche gerade die Windblütler erzeugen. </s>
            <s xml:id="echoid-s1569" xml:space="preserve">Schüttelt man
              <lb/>
            zur Blütezeit einen Haſelſtrauch, eine Kiefer oder die Ähre
              <lb/>
            eines Graſes, ſo löſt ſich der Blütenſtaub in Wolkenform von
              <lb/>
            den Äſten ab und verbreitet ſich weithin in die Luft. </s>
            <s xml:id="echoid-s1570" xml:space="preserve">Dieſe
              <lb/>
            maſſenhafte Loslöſung und Weiterführung des Blütenſtaubes
              <lb/>
            hat ihren Grund in beſtimmten Einrichtungen der Blüte.
              <lb/>
            </s>
            <s xml:id="echoid-s1571" xml:space="preserve">Die reifen Staubbeutel ragen z. </s>
            <s xml:id="echoid-s1572" xml:space="preserve">B. </s>
            <s xml:id="echoid-s1573" xml:space="preserve">bei den Gräſern weit aus
              <lb/>
            der Blüte hervor; </s>
            <s xml:id="echoid-s1574" xml:space="preserve">ſie ſitzen an langen biegſamen Fäden und
              <lb/>
            ſchaukeln außerhalb der Blüte hin und her. </s>
            <s xml:id="echoid-s1575" xml:space="preserve">Von ſolchen an
              <lb/>
            zarten, fadenförmigen Fäden hängenden, durch die Luft hin
              <lb/>
            und her bewegten Staubbeuteln wird begreiflicherweiſe der
              <lb/>
            Blütenſtaub leicht ausgeſchüttelt. </s>
            <s xml:id="echoid-s1576" xml:space="preserve">In anderer Weiſe wird das
              <lb/>
            Ausſtäuben begünſtigt bei den Birken, Erlen, Haſelſträuchern,
              <lb/>
            Pappeln u. </s>
            <s xml:id="echoid-s1577" xml:space="preserve">ſ. </s>
            <s xml:id="echoid-s1578" xml:space="preserve">w.</s>
            <s xml:id="echoid-s1579" xml:space="preserve">, wo ſich die Staubblattblüten an lang-
              <lb/>
            geſtreckten, biegſamen, leicht in Bewegung zu verſetzenden
              <lb/>
            Kätzchen befinden, welche ſelbſt durch ſchwache Luftſtrömungen
              <lb/>
            hin und her geworfen werden. </s>
            <s xml:id="echoid-s1580" xml:space="preserve">Die Blütenſtäude mit den
              <lb/>
            Stempelblüten haben dieſe leichte Beweglichkeit nicht nötig.</s>
            <s xml:id="echoid-s1581" xml:space="preserve"/>
          </p>
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