nfoto Posted November 17, 2015 Share Posted November 17, 2015 Rørslett, B. 2015. Pauridia scullyi Baker (Hypoxidaceae). African flowers photographed in visible and ultraviolet light. http://www.ultraviol...ully-cape-star/ Syn. Spiloxene scullyi (Baker) Garside Found in the Kamiesberg area near Kamieskroon, Northern Cape, South Africa. September 2015. The plants were growing in shaded cracks in a rock face. Image reference: PAUR_SCU_G1509066567_VISVisible light: Nikon Df, Voigtländer 125 mm f/2.5 APO-Lanthar lens, daylight Front view of flowers in UV shows the large UV-dark patches on the basal part of the sepals. Image reference: PAUR_SCU_I1509062784_UV However, the rear view demonstrates an entirely different UV appearance, in which there are no basal darkening. Instead, the lower sepals are rendered in a blue hue compared to the pale yellow of the upper circle of sepals. Both UV images obtained with Nikon D3200, UV-Nikkor 105 mm f/4.5 lens, Baader U2" ('Venus') filter (built-in), SB-140 flash. References: http://www.ultraviol...-r%C3%B8rslett/ [ Published 18 November 2015] Link to comment
Andrea B. Posted November 18, 2015 Share Posted November 18, 2015 And yet another UV surprise !Very interesting. Link to comment
nfoto Posted November 18, 2015 Author Share Posted November 18, 2015 Indeed. The differentiated UV rendition was a surprise, but apparently a widespread feature. A lot of the African flowers I documented on this trip to Western Cape and Namaqualand had a similar duality in their UV signature. This was mainly seen with the members of Asteraceae, but might be a spurious correlation as my main efforts of documenting each side of the flower structure in UV concentrated there. It has to be understood that the species diversity in this region is massively high by any standards and only the tiniest fraction of these species can be photographed by a single person on a single trip. I will not begin to elaborate on the challenge of assigning correct IDs to the sampled species. The occasional identification errors probably are unavoidable, but I tried to post several photos of each plant so as to enable better identification by those more familiar with the African flora than myself. Link to comment
Andrea B. Posted November 18, 2015 Share Posted November 18, 2015 Identification is always subject to updates. Else we would never get anything posted. "-) Link to comment
nfoto Posted November 18, 2015 Author Share Posted November 18, 2015 You might misread me. What I intended was that the first posting is conducted with the ID found most plausible after checking details against all available information (from published prospectus, local floras, field guides, etc.) sans official herbaria. However, when one encounters a regional flora containing tens of thousands of species and the available literature is not up to the level of detail we are seeing say in European floras, the occasional errors should be expected. Link to comment
Andrea B. Posted November 19, 2015 Share Posted November 19, 2015 No, I understand! We use the best flora/guides/keys/online references we can find. But every location has some uncertain areas. New species are still being discovered out west here, for example. This summer I learned that there was a herbarium on Mount Desert Island where we go every summer. But I'm not good with dried, flattened specimens. Link to comment
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