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Equisetum fluviatile [Water Horsetail]: Stems

Fluorescence
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#1 nfoto

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Posted 03 April 2013 - 20:35

Rørslett, B. 2013. Stems of Equisetum fluviatile (Equisetaceae). Water Horsetail. Plants photographed in infrared and ultraviolet light, included fluorescence. http://www.ultraviol...orsetail-stems/

Equisetum fluviatile L.
NO: Elvesnelle

This widely distributed aquatic emergent macrophyte occurs over a huge range of habitats and ecological conditions. Accordingly, there is a lot of variation as to how the plants appear, from fairly slender low on poor sites to tall stems 2 m high with thick stems in eutrophic locations. Stems are unbranched or carry thin side branches in whorls from regularly spaced nodes.

The stems are very rich in silica and this makes them reflect infrared intensively. Only the apices of the tooth come out dark in IR.

When illuminated by a ultraviolet light source, E. fluviatile stems fluoresce a deep beautiful red. This is due to their chlorophyll content.

Attached Image: EQUI_FLU_Z1105198959_IR.jpg
Image reference: :EQUI_FLU_Z1105198959_IR.jpg
Infrared photography: Nikon D200 broad spectrum, 105 mm f/4 Micro-Nikkor lens, B+W O-93 IR filter, daylight.

Attached Image: EQUI_FLU_A11052130812_IR.jpg
Image reference: EQUI_FLU_A11052130812_IR.jpg
Infrared photography: Nikon D200 broad spectrum, 105 mm f/4 Micro-Nikkor lens, Hoya R720 IR filter, SB-14 flash.

Attached Image: EQUI_FLU_I11052101163_UVIFL.jpg
Image reference: EQUI_FLU_I11052101163_UVIFL.jpg
Ultraviolet induced fluorescence: Nikon D200 broad spectrum, 105 mm f/4 Micro-Nikkor lens, Baader UV/IR Cut filter, Sylvania Blacklight.