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Strange horsetail.

Observed: 8th June 2011 By: everslickeverslick’s reputation in Plantseverslick’s reputation in Plantseverslick’s reputation in Plants
Img_7619
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Description:

Found this horse tail is a pond. Cannot find a similar thing in my books. Could possibly be introduced. The leaves are unbranched, flat and dark green. The stem is solid, with small holes running through.
Any ideas please?
Thanks

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No interactions present.