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Berührungszeilen

English translation: phyllotactic spirals


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19:44 Feb 4, 2011
German to English translations [PRO]
Science - Botany
German term or phrase: Berührungszeilen
A figure caption (but no figure to go with it):
Rosette von Aeonium tabuliforme (Dickblattgewächs von den Kanaren) mit eingezeichneten Berührungszeilen.
Lines of contact?

Thanks in advance for any help.
John Speese
United States
Local time: 22:02
English translation:phyllotactic spirals
Explanation:
Notice that the spine clusters occur in two sets of intersecting spirals -- phyllotactic spirals.

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Note added at 34 mins (2011-02-04 20:19:02 GMT)
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Vor allem bei Kugelkakteen die durch die Warzenanordnung gebildeten, theoretischen, einerseits nach links und andererseits nach rechts verlaufenden spiraligen Zeilen ("Spiralzeilen"). Die Anzahl der rechts- bzw. linkslaufenden Berührungszeilen folgen in der Regel der Fibonacci-Reihe[..]
http://www.kakteensammlung-holzheu.de/gattungen.htmlBerührun...

Spiral leaf arrangement. This kind of leaf arrangement is less common in Gesneriaceae. In the New World Gesneriaceae this pattern is found in Gesneria, Rhytidophyllum, and a few others. A spiral phyllotaxis is often found in rosette plants, e.g. in Saintpaulia, in the European genera Ramonda, Haberlea, Jancaea, and numerous Chinese-Himalayan genera. Petrocosmea forrestii has a conspicuously dense and flat rosette similar to the “Dinner plate” (Aeonium tabuliforme).
http://www.gesneriads.ca/Articles/Weber - Scientific Overvie...


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Note added at 38 mins (2011-02-04 20:22:35 GMT)
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In botany, phyllotaxis or phyllotaxy is the arrangement of the leaves on the stem of a plant. The basic patterns are alternate, opposite, whorled or spiral. [..]
The most famous example is the sunflower head. This phyllotactic pattern creates an optical illusion of criss-crossing spirals. In the botanical literature, these designs are described by the number of counter-clockwise spirals and the number of clockwise spirals. These also turn out to be Fibonacci numbers.
http://www.worldlingo.com/ma/enwiki/en/Phyllotaxis
Selected response from:

rikka
Local time: 04:02
Grading comment
Sounds good to me, thanks!
4 KudoZ points were awarded for this answer



Summary of answers provided
4phyllotactic spirals
rikka
Summary of reference entries provided
detailed description below
Ingeborg Gowans

  

Answers


27 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
phyllotactic spirals


Explanation:
Notice that the spine clusters occur in two sets of intersecting spirals -- phyllotactic spirals.

--------------------------------------------------
Note added at 34 mins (2011-02-04 20:19:02 GMT)
--------------------------------------------------

Vor allem bei Kugelkakteen die durch die Warzenanordnung gebildeten, theoretischen, einerseits nach links und andererseits nach rechts verlaufenden spiraligen Zeilen ("Spiralzeilen"). Die Anzahl der rechts- bzw. linkslaufenden Berührungszeilen folgen in der Regel der Fibonacci-Reihe[..]
http://www.kakteensammlung-holzheu.de/gattungen.htmlBerührun...

Spiral leaf arrangement. This kind of leaf arrangement is less common in Gesneriaceae. In the New World Gesneriaceae this pattern is found in Gesneria, Rhytidophyllum, and a few others. A spiral phyllotaxis is often found in rosette plants, e.g. in Saintpaulia, in the European genera Ramonda, Haberlea, Jancaea, and numerous Chinese-Himalayan genera. Petrocosmea forrestii has a conspicuously dense and flat rosette similar to the “Dinner plate” (Aeonium tabuliforme).
http://www.gesneriads.ca/Articles/Weber - Scientific Overvie...


--------------------------------------------------
Note added at 38 mins (2011-02-04 20:22:35 GMT)
--------------------------------------------------

In botany, phyllotaxis or phyllotaxy is the arrangement of the leaves on the stem of a plant. The basic patterns are alternate, opposite, whorled or spiral. [..]
The most famous example is the sunflower head. This phyllotactic pattern creates an optical illusion of criss-crossing spirals. In the botanical literature, these designs are described by the number of counter-clockwise spirals and the number of clockwise spirals. These also turn out to be Fibonacci numbers.
http://www.worldlingo.com/ma/enwiki/en/Phyllotaxis

rikka
Local time: 04:02
Native speaker of: Native in RussianRussian
PRO pts in category: 8
Grading comment
Sounds good to me, thanks!
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Reference comments


21 mins
Reference: detailed description below

Reference information:
http://www.cactus-art.biz/schede/AEONIUM/Aeonium_tabulaeform...

I would simply stay with rosettes overlapping as shows the illustration; hope it helps a bit

Ingeborg Gowans
Canada
Native speaker of: Native in GermanGerman
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