nfoto Posted April 18, 2013 Share Posted April 18, 2013 Rørslett, B. 2013. Lamiastrum galeobdolon (L.) Ehrend. & Polatschek (Lamiaceae). Yellow Archangel. Flowers photographed in visible and ultraviolet light, including fluorescence. Lamiastrum galeobdolon (L.) Ehrend. & PolatschekSyn. Galeobdolon luteum Huds., Lamium galeobdolon (L.) L.NO: Gulltvetann, gulltvitannSE: Gulplister, guldplister, gulsugaDK: GuldnældeFI: KeltapeippiDE: GoldnesselEN: Yellow Archangel A creeping perennial plant native to Europe, L. galeobdon has inflorescenses with showy yellow flowers and variegated foliage. It is used as an ornamental plant and occurrences towards the north of its distribution area probably are garden escapes. It is tolerant of shady conditions and occurs as a mat-forming understorey plant in rich decidious forests. Flowering takes place in late spring or early summer. Seeds are dispersed by ants (myrmechori). Plants collected and photographed near Oslo, Norway 21 May 2011. Image reference: LAMI_GAL_I11052101970_VIS.jpgVisible light: Nikon D200, UV-Nikkor 105 mm f/4.5 lens, Baader UV/IR Cut filter, Broncolor Minicom studio flash, focus stacking (10 frames in Zerene Stacker) Image reference: LAMI_GAL_I11052134690_UV.jpgUltraviolet light: Nikon D40X, UV-Nikkor 105 mm f/4.5 lens, Baader U 2"(Venus) filter, Broncolor Minicom studio flash, focus stacking (10 frames in Zerene Stacker) The UV appareance of L. galeobdolon mimics its visible counterpart. Anthers are very UV-dark, so are the upper part of the style and the calyx. The corolla is very bright in UV so as to make the flowers stand out from the surrounding UV-dark foliage. Image reference: LAMI_GAL_I1105220218_UVIFL.jpgUltraviolet induced visible fluorescence: Nikon D200, UV-Nikkor 105 mm f/4.5 lens, Baader UV/IR Cut filter, Nichia UV LED torch (narrowband peak at 365 nm) This species exhibit a beautiful fluorescence when illuminated by UV light. The anthers shine bright blueish white and there are very brightly fluoresceing tips of the lower corolla lip as well. The reddish areas indicate fluorescence by chlorophyll. [Published 18 Apr 2013] Link to comment
Nico Posted May 26, 2013 Share Posted May 26, 2013 I was just preparing a post about L. galeoptodon when I found your post. The focus-stacked images look really great!However, what is also interesting is that the plants in my area (Germany between Heidelberg and Frankfurt) have a clearly a different UV-pattern. You have found a pattern that is similar to the visual appearance and in the case of the plants that I have photographed, the lip is entirely dark, unlike the visual appearance. So it might be worth posting them separately in a formal way … (?)I've recorded a couple of flowers and the appearance was always simmilar. visual imageimage reference: NCH_P1080700130524 UV imageimagae reference: NCH_P1080737130524 Link to comment
nfoto Posted May 26, 2013 Author Share Posted May 26, 2013 I think it is better to post your photos in a different article and make a cross-reference. There are several taxa described for L. galeobdolon at the subspecies level. I would not be surprised if there are differences to be found in their UV signatures. Link to comment
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