Horsetail -but which one?

Horsetail -but which one?

Observation - Horsetail -but which one? - UK and Ireland. Description: Beautiful young Horsetail plants growing in Teesdale. I have looked at identifying them myself but found it difficult. I have looked at the BSBI link :http://www.nhm.ac.uk/hosted_sites/bps/ferncrib/Equisetum.pdf but would welcome some assistance.

Beautiful young Horsetail plants growing in Teesdale. I have looked at identifying them myself but found it difficult. I have looked at the BSBI link :http://www.nhm.ac.uk/hosted_sites/bps/ferncrib/Equisetum.pdf but would welcome some assistance.