isoetes and huperzia

Hi, does anyone know where I can get specimens of Isoetes or Huperzia in the UK? I am specifically interested in I. histrix, I. engelmannii, Huperzia squarrosa, H. phlegmaria, H. nummularifolia and H. selago.
Also if anyone has any good tips on growing these I'd be gratefull to hear them! 

Thanks
Lizzy

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Lizzy Ruszala
School of Biological Sciences
University of Bristol

Lizzy.Ruszala@bris.ac.uk

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