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Equisetum fluviatile [Water Horsetail]: Stems


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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.

 

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.

 

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.

 

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.

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