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Eucalyptus globulus subsp. globulus [Tasmanian Blue Gum]

Fluorescence
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#1 DaveO

    Aussie Bunyip

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  • Location: Maldon, Victoria, Australia

Posted 13 July 2015 - 04:58

Oldfield, D. 2015. Eucalyptus globulus Labill. subsp. globulus (Myrtaceae) Tasmanian Blue Gum. Flowers photographed in visible and ultraviolet light.
http://www.ultraviol...anian-blue-gum/
Synonym
Eucalyptus gigantea Dehnh.

Maldon, Victoria, Australia
23 June 2015
Australian Native Wildflower as Garden Specimen

Comment
Eucalyptus globulus subsp. globulus is distributed mainly in south-eastern Tasmania and the Otway Ranges and Wilson’s Promontory in Victoria. It is widely planted in Western Victoria as a source of woodchips for paper production.

The most striking feature of the UV images was the UV-white reflection from the outside of the un-opened buds, which corresponded to a visible light blue-green (turquoise?) colour. The buds are described as "glaucous" which means covered with a white wax. According to Wiki "Epicuticular wax can reflect UV light, such as the white wax coating of "Dudleya brittonnii" which has the highest UV reflectivity of any known biological substance". That seems to nail it!

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_globulus_Vis_1.jpg
Image Reference: DO60681

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_globulus_UV_1.jpg
Image Reference: DO60684

A closer look at the bud at 100% magnification
Attached Image: Eucalyptus_globulus_UV_1_bud.jpg

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_globulus_UVIVFL_1.jpg
Image Reference: DO60686

Another set

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_globulus_Vis_2.jpg
Image Reference: DO60688

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_globulus_UV_2.jpg
Image Reference: DO60690

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_globulus_UVIVFL_2.jpg
Image Reference: DO60694

References:
Elliott, W.R. and Jones, D.L. Encyclopaedia of Australian Plants suitable for cultivation, Volume 4, 1986, Lothian, p. 103.
EUCLID Eucalypts of Australia, Centre for Plant Biodiversity Research, 2006, Third Edition, DVD.

Published 13 July 2015