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Eucalyptus leucoxylon [Yellow Gum]


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#1 DaveO

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Posted 08 February 2014 - 03:55

Oldfield, D. 2013. Eucalyptus leucoxylon F. Muell. (Myrtaceae) Yellow Gum. Flowers photographed in visible and ultraviolet light.
http://www.ultraviol...lon-yellow-gum/

Maldon, Victoria, Australia
5 November 2013
Australian Native Flowering Tree as Garden Specimen

Comment
Eucalyptus leucoxylon is a small tree with fairly open foliage with flowers which range from white to cream to pink to red.



Visible Light: Pentax K-5 Full Spectrum Modification, Quartz 105 mm f/4.0 lens, Nikon SB-14 flash, 1/180 s @ f/16 ISO 200, B+W UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_Vis.jpg
Image Reference: DO51771

Ultraviolet Light: Pentax K-5 Full Spectrum Modification, Quartz 105 mm f/4.0 lens, Nikon SB-14 flash, 1/180s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_UV.jpg
Image Reference: DO51772

References:
Elliott, W.R. and Jones, D.L. Encyclopaedia of Australian Plants suitable for cultivation, Lothian 1986, Volume 4, p. 131.


Atlas of Living Australia http://bie.ala.org.a...ptus+leucoxylon


Published 8 February 2014

#2 DaveO

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Posted 03 July 2015 - 00:36

Another set to show the buds which appear to have a single bud cap (operculum) not an inner and outer one as seen in Corymbia maculata.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_red_buds_Vis.jpg
Image Reference: DO60630

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_red_buds_UV.jpg
Image Reference: DO60633

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Eucalyptus_leucoxylon_red_buds_UVIVFL.jpg
Image Reference: DO60634

#3 colinbm

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Posted 03 July 2015 - 02:16

Spectactular Dave ;)

#4 DaveO

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Posted 05 July 2015 - 05:27

Another set to show the cream flowered form.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_Cream_Vis.jpg
Image Reference: DO60669

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_Cream_UV.jpg
Image Reference: DO60672

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Eucalyptus_leucoxylon_Cream_UVIVFL.jpg
Image Reference: DO60673

#5 colinbm

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Posted 05 July 2015 - 05:57

Good one Dave.

#6 Andrea B.

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Posted 05 July 2015 - 17:26

Now I am wondering if that blue-ish area on the stamens in Post #4 is fluorescence or blue leak?

The stamens have such a wonderful fiber optic appearance when the flower opens.

Man, I love these cool flowers you find, Dave. Wow!
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#7 DaveO

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Posted 06 July 2015 - 03:51

I did the stainless steel spoon test with this camera as part of my "calibration"

This is the spoon with the unfiltered UV-LED showing the "blue leak" that you suspected, 10 seconds f/11
Attached Image: UV_LED_Unfiltered.jpg

This is with the Baader-U over the UV-LED, same exposure
Attached Image: UV_LED_BDUfilter.jpg

#8 Andrea B.

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Posted 11 July 2015 - 13:39

This is an excellent series, Dave. And thanks for the Shiny Metal Test to remind everyone how to test their fluorescence set-up for visible leaks.
Andrea G. Blum
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#9 DaveO

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Posted 12 July 2015 - 03:26

But wait.... there’s more...

I though it would be a good idea (famous last words) to try to see what the inside of the buds caps looked like, especially in UVIVFL, to find out if there was any blue fluorescence as on the inner operculum of Corymbia maculata http://www.ultraviol...ta-spotted-gum/
The sets above seem (to me at least) to show that for Eucalyptus leucoxylon the inner and outer opercula are fused and are lost as one when the bud cap (operculum) is shed. So, I took some of the unopened buds from the cream form above and sliced off the bud cap and removed the stamens.

In these images the operculum on the left is from the red flowered form which separated naturally and the one on the right is by dissection of the cream flowered form.

My dissection skills leave a lot to be desired, I won’t become an “amateur brain surgeon” at this rate.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_red & cream_bud caps_Vis.jpg
Image Reference: DO60674

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_red & cream_bud caps_UV.jpg
Image Reference: DO60677

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Eucalyptus_leucoxylon_red & cream_bud caps_UVIVFL.jpg
Image Reference: DO60678

#10 DaveO

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Posted 12 July 2015 - 03:44

The story continues ...

What you should know now is that all the Eucalyptus leucoxylon trees planted here were grown from seeds collected on our previous property from red flowered and cream flowered trees. In general the flower colour may vary in the seedlings from that of the parent.

I couldn’t find any cream flowers that were shedding their bud caps naturally but I found a tree which I thought was cream but turned out to have flowers with a faint pink tinge which is not very visible in the images below.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_Pink_Vis.jpg
Image Reference: DO60697

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_Pink_UV.jpg
Image Reference: DO60701

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Eucalyptus_leucoxylon_Pink_UVIVFL.jpg
Image Reference: DO60703

#11 DaveO

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Posted 12 July 2015 - 03:52

I then carefully pulled the bud cap off and placed it to the left of the bud with the cap from the previous red flowered form to the right in these images.

Visible Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/200 s @ f/16 ISO 200, Baader UV/IR Cut Filter.
Attached Image: Eucalyptus_leucoxylon_Pink_bud_cap_Vis.jpg
Image Reference: DO60708

Ultraviolet Light: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/200s @ f/16 ISO 200, Baader UV-Pass Filter.
Attached Image: Eucalyptus_leucoxylon_Pink_bud_cap_UV.jpg
Image Reference: DO60709

Ultraviolet Induced Visible Fluorescence: Nikon D750 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/16 ISO 400.
Attached Image: Eucalyptus_leucoxylon_Pink_bud_cap_UVIVFL.jpg
Image Reference: DO60712

#12 Andrea B.

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Posted 12 July 2015 - 04:00

Isn't that amazing! The bud caps look like delicate, glowing, little sea shells in the fluorescence photo. Quite beautiful.
Andrea G. Blum
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#13 DaveO

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Posted 12 July 2015 - 05:53

I like to think that no one has ever seen this before. It's only a Gum Tree after all :rolleyes:

#14 colinbm

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Posted 12 July 2015 - 07:34

Only a Gum Tree...........

#15 Andrea B.

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Posted 13 July 2015 - 03:40

I think that sums up so nicely how many of us feel about our adventures in UV land -- Wow, no one has ever seen this before !!!!
We are lucky folks to get to do this stuff.

Great work, Dave. Excellent series. Wonderful photographs.
(And I know you will soon have that Amateur Brain Surgeon certification nailed!)
Andrea G. Blum
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#16 DaveO

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Posted 13 July 2015 - 04:38

This is a silly question, I'm good at asking those. Are there any other flowers which are basically just stamens (ie. no petals or sepals), and as a second bite at the same cherry, are stamens ALWAYS UV-dark. I guess Acacia (Wattles to us Aussies) also fit that bill.

#17 Andrea B.

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Posted 13 July 2015 - 16:36

Not a silly question. There are indeed many flowers with no petals. The gazillion grass flowers in the world have no petals. We usually think of grass as having flowers but they do. In the Asteraceae family, there are many examples of flowers which have no rays (which we typically think of as petals) and have only small disk flowers. But I know you are thinking of flowers with only stamens like these Gum flowers. Many trees have such flowers.

Maybe some other folks will chime in with specific examples.

Stamens are not always UV-dark. I'll look around and find some examples from our posts.
Andrea G. Blum
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